forked from Mirrors/apostrophe
1733 lines
56 KiB
JavaScript
1733 lines
56 KiB
JavaScript
/* vim: set tabstop=4 softtabstop=4 shiftwidth=4 noexpandtab: */
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/**
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* Backbone-relational.js 0.7.1
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* (c) 2011-2013 Paul Uithol and contributors (https://github.com/PaulUithol/Backbone-relational/graphs/contributors)
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*
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* Backbone-relational may be freely distributed under the MIT license; see the accompanying LICENSE.txt.
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* For details and documentation: https://github.com/PaulUithol/Backbone-relational.
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* Depends on Backbone (and thus on Underscore as well): https://github.com/documentcloud/backbone.
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*/
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( function( undefined ) {
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"use strict";
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/**
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* CommonJS shim
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**/
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var _, Backbone, exports;
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if ( typeof window === 'undefined' ) {
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_ = require( 'underscore' );
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Backbone = require( 'backbone' );
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exports = module.exports = Backbone;
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}
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else {
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_ = window._;
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Backbone = window.Backbone;
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exports = window;
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}
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Backbone.Relational = {
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showWarnings: true
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};
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/**
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* Semaphore mixin; can be used as both binary and counting.
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**/
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Backbone.Semaphore = {
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_permitsAvailable: null,
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_permitsUsed: 0,
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acquire: function() {
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if ( this._permitsAvailable && this._permitsUsed >= this._permitsAvailable ) {
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throw new Error( 'Max permits acquired' );
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}
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else {
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this._permitsUsed++;
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}
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},
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release: function() {
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if ( this._permitsUsed === 0 ) {
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throw new Error( 'All permits released' );
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}
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else {
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this._permitsUsed--;
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}
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},
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isLocked: function() {
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return this._permitsUsed > 0;
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},
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setAvailablePermits: function( amount ) {
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if ( this._permitsUsed > amount ) {
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throw new Error( 'Available permits cannot be less than used permits' );
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}
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this._permitsAvailable = amount;
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}
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};
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/**
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* A BlockingQueue that accumulates items while blocked (via 'block'),
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* and processes them when unblocked (via 'unblock').
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* Process can also be called manually (via 'process').
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*/
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Backbone.BlockingQueue = function() {
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this._queue = [];
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};
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_.extend( Backbone.BlockingQueue.prototype, Backbone.Semaphore, {
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_queue: null,
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add: function( func ) {
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if ( this.isBlocked() ) {
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this._queue.push( func );
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}
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else {
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func();
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}
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},
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process: function() {
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while ( this._queue && this._queue.length ) {
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this._queue.shift()();
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}
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},
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block: function() {
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this.acquire();
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},
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unblock: function() {
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this.release();
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if ( !this.isBlocked() ) {
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this.process();
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}
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},
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isBlocked: function() {
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return this.isLocked();
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}
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});
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/**
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* Global event queue. Accumulates external events ('add:<key>', 'remove:<key>' and 'update:<key>')
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* until the top-level object is fully initialized (see 'Backbone.RelationalModel').
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*/
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Backbone.Relational.eventQueue = new Backbone.BlockingQueue();
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/**
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* Backbone.Store keeps track of all created (and destruction of) Backbone.RelationalModel.
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* Handles lookup for relations.
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*/
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Backbone.Store = function() {
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this._collections = [];
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this._reverseRelations = [];
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this._subModels = [];
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this._modelScopes = [ exports ];
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};
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_.extend( Backbone.Store.prototype, Backbone.Events, {
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addModelScope: function( scope ) {
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this._modelScopes.push( scope );
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},
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/**
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* Add a set of subModelTypes to the store, that can be used to resolve the '_superModel'
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* for a model later in 'setupSuperModel'.
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*
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* @param {Backbone.RelationalModel} subModelTypes
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* @param {Backbone.RelationalModel} superModelType
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*/
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addSubModels: function( subModelTypes, superModelType ) {
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this._subModels.push({
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'superModelType': superModelType,
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'subModels': subModelTypes
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});
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},
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/**
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* Check if the given modelType is registered as another model's subModel. If so, add it to the super model's
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* '_subModels', and set the modelType's '_superModel', '_subModelTypeName', and '_subModelTypeAttribute'.
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*
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* @param {Backbone.RelationalModel} modelType
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*/
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setupSuperModel: function( modelType ) {
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_.find( this._subModels || [], function( subModelDef ) {
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return _.find( subModelDef.subModels || [], function( subModelTypeName, typeValue ) {
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var subModelType = this.getObjectByName( subModelTypeName );
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if ( modelType === subModelType ) {
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// Set 'modelType' as a child of the found superModel
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subModelDef.superModelType._subModels[ typeValue ] = modelType;
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// Set '_superModel', '_subModelTypeValue', and '_subModelTypeAttribute' on 'modelType'.
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modelType._superModel = subModelDef.superModelType;
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modelType._subModelTypeValue = typeValue;
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modelType._subModelTypeAttribute = subModelDef.superModelType.prototype.subModelTypeAttribute;
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return true;
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}
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}, this );
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}, this );
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},
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/**
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* Add a reverse relation. Is added to the 'relations' property on model's prototype, and to
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* existing instances of 'model' in the store as well.
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* @param {Object} relation
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* @param {Backbone.RelationalModel} relation.model
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* @param {String} relation.type
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* @param {String} relation.key
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* @param {String|Object} relation.relatedModel
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*/
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addReverseRelation: function( relation ) {
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var exists = _.any( this._reverseRelations || [], function( rel ) {
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return _.all( relation || [], function( val, key ) {
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return val === rel[ key ];
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});
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});
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if ( !exists && relation.model && relation.type ) {
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this._reverseRelations.push( relation );
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this._addRelation( relation.model, relation );
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this.retroFitRelation( relation );
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}
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},
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_addRelation: function( model, relation ) {
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if ( !model.prototype.relations ) {
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model.prototype.relations = [];
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}
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model.prototype.relations.push( relation );
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_.each( model._subModels || [], function( subModel ) {
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this._addRelation( subModel, relation );
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}, this );
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},
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/**
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* Add a 'relation' to all existing instances of 'relation.model' in the store
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* @param {Object} relation
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*/
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retroFitRelation: function( relation ) {
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var coll = this.getCollection( relation.model );
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coll.each( function( model ) {
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if ( !( model instanceof relation.model ) ) {
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return;
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}
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new relation.type( model, relation );
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}, this);
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},
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/**
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* Find the Store's collection for a certain type of model.
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* @param {Backbone.RelationalModel} model
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* @return {Backbone.Collection} A collection if found (or applicable for 'model'), or null
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*/
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getCollection: function( model ) {
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if ( model instanceof Backbone.RelationalModel ) {
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model = model.constructor;
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}
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var rootModel = model;
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while ( rootModel._superModel ) {
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rootModel = rootModel._superModel;
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}
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var coll = _.detect( this._collections, function( c ) {
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return c.model === rootModel;
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});
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if ( !coll ) {
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coll = this._createCollection( rootModel );
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}
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return coll;
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},
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/**
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* Find a type on the global object by name. Splits name on dots.
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* @param {String} name
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* @return {Object}
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*/
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getObjectByName: function( name ) {
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var parts = name.split( '.' ),
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type = null;
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_.find( this._modelScopes || [], function( scope ) {
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type = _.reduce( parts || [], function( memo, val ) {
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return memo ? memo[ val ] : undefined;
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}, scope );
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if ( type && type !== scope ) {
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return true;
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}
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}, this );
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return type;
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},
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_createCollection: function( type ) {
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var coll;
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// If 'type' is an instance, take its constructor
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if ( type instanceof Backbone.RelationalModel ) {
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type = type.constructor;
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}
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// Type should inherit from Backbone.RelationalModel.
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if ( type.prototype instanceof Backbone.RelationalModel ) {
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coll = new Backbone.Collection();
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coll.model = type;
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this._collections.push( coll );
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}
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return coll;
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},
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/**
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* Find the attribute that is to be used as the `id` on a given object
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* @param type
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* @param {String|Number|Object|Backbone.RelationalModel} item
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* @return {String|Number}
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*/
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resolveIdForItem: function( type, item ) {
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var id = _.isString( item ) || _.isNumber( item ) ? item : null;
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if ( id === null ) {
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if ( item instanceof Backbone.RelationalModel ) {
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id = item.id;
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}
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else if ( _.isObject( item ) ) {
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id = item[ type.prototype.idAttribute ];
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}
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}
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// Make all falsy values `null` (except for 0, which could be an id.. see '/issues/179')
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if ( !id && id !== 0 ) {
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id = null;
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}
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return id;
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},
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/**
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*
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* @param type
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* @param {String|Number|Object|Backbone.RelationalModel} item
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*/
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find: function( type, item ) {
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var id = this.resolveIdForItem( type, item );
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var coll = this.getCollection( type );
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// Because the found object could be of any of the type's superModel
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// types, only return it if it's actually of the type asked for.
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if ( coll ) {
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var obj = coll.get( id );
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if ( obj instanceof type ) {
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return obj;
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}
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}
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return null;
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},
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/**
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* Add a 'model' to its appropriate collection. Retain the original contents of 'model.collection'.
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* @param {Backbone.RelationalModel} model
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*/
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register: function( model ) {
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var coll = this.getCollection( model );
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if ( coll ) {
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if ( coll.get( model ) ) {
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if ( Backbone.Relational.showWarnings && typeof console !== 'undefined' ) {
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console.warn( 'Duplicate id! Old RelationalModel:%o, New RelationalModel:%o', coll.get( model ), model );
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}
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throw new Error( "Cannot instantiate more than one Backbone.RelationalModel with the same id per type!" );
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}
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var modelColl = model.collection;
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coll.add( model );
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model.bind( 'destroy', this.unregister, this );
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model.collection = modelColl;
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}
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},
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/**
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* Explicitly update a model's id in its store collection
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* @param {Backbone.RelationalModel} model
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*/
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update: function( model ) {
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var coll = this.getCollection( model );
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coll._onModelEvent( 'change:' + model.idAttribute, model, coll );
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},
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/**
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* Remove a 'model' from the store.
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* @param {Backbone.RelationalModel} model
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*/
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unregister: function( model ) {
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model.unbind( 'destroy', this.unregister );
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var coll = this.getCollection( model );
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coll && coll.remove( model );
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}
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});
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Backbone.Relational.store = new Backbone.Store();
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/**
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* The main Relation class, from which 'HasOne' and 'HasMany' inherit. Internally, 'relational:<key>' events
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* are used to regulate addition and removal of models from relations.
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*
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* @param {Backbone.RelationalModel} instance
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* @param {Object} options
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* @param {string} options.key
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* @param {Backbone.RelationalModel.constructor} options.relatedModel
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* @param {Boolean|String} [options.includeInJSON=true] Serialize the given attribute for related model(s)' in toJSON, or just their ids.
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* @param {Boolean} [options.createModels=true] Create objects from the contents of keys if the object is not found in Backbone.store.
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* @param {Object} [options.reverseRelation] Specify a bi-directional relation. If provided, Relation will reciprocate
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* the relation to the 'relatedModel'. Required and optional properties match 'options', except that it also needs
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* {Backbone.Relation|String} type ('HasOne' or 'HasMany').
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*/
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Backbone.Relation = function( instance, options ) {
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this.instance = instance;
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// Make sure 'options' is sane, and fill with defaults from subclasses and this object's prototype
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options = _.isObject( options ) ? options : {};
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this.reverseRelation = _.defaults( options.reverseRelation || {}, this.options.reverseRelation );
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this.reverseRelation.type = !_.isString( this.reverseRelation.type ) ? this.reverseRelation.type :
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Backbone[ this.reverseRelation.type ] || Backbone.Relational.store.getObjectByName( this.reverseRelation.type );
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this.model = options.model || this.instance.constructor;
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this.options = _.defaults( options, this.options, Backbone.Relation.prototype.options );
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this.key = this.options.key;
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this.keySource = this.options.keySource || this.key;
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this.keyDestination = this.options.keyDestination || this.keySource || this.key;
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// 'exports' should be the global object where 'relatedModel' can be found on if given as a string.
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this.relatedModel = this.options.relatedModel;
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if ( _.isString( this.relatedModel ) ) {
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this.relatedModel = Backbone.Relational.store.getObjectByName( this.relatedModel );
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}
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if ( !this.checkPreconditions() ) {
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return;
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}
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if ( instance ) {
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var contentKey = this.keySource;
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if ( contentKey !== this.key && typeof this.instance.get( this.key ) === 'object' ) {
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contentKey = this.key;
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}
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this.keyContents = this.instance.get( contentKey );
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// Explicitly clear 'keySource', to prevent a leaky abstraction if 'keySource' differs from 'key'.
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if ( this.keySource !== this.key ) {
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this.instance.unset( this.keySource, { silent: true } );
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}
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// Add this Relation to instance._relations
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this.instance._relations.push( this );
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}
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// Add the reverse relation on 'relatedModel' to the store's reverseRelations
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if ( !this.options.isAutoRelation && this.reverseRelation.type && this.reverseRelation.key ) {
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Backbone.Relational.store.addReverseRelation( _.defaults( {
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isAutoRelation: true,
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model: this.relatedModel,
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relatedModel: this.model,
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reverseRelation: this.options // current relation is the 'reverseRelation' for its own reverseRelation
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},
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this.reverseRelation // Take further properties from this.reverseRelation (type, key, etc.)
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) );
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}
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_.bindAll( this, '_modelRemovedFromCollection', '_relatedModelAdded', '_relatedModelRemoved' );
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if ( instance ) {
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this.initialize();
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if ( options.autoFetch ) {
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this.instance.fetchRelated( options.key, _.isObject( options.autoFetch ) ? options.autoFetch : {} );
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}
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// When a model in the store is destroyed, check if it is 'this.instance'.
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Backbone.Relational.store.getCollection( this.instance )
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.bind( 'relational:remove', this._modelRemovedFromCollection );
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// When 'relatedModel' are created or destroyed, check if it affects this relation.
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Backbone.Relational.store.getCollection( this.relatedModel )
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.bind( 'relational:add', this._relatedModelAdded )
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.bind( 'relational:remove', this._relatedModelRemoved );
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}
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};
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// Fix inheritance :\
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Backbone.Relation.extend = Backbone.Model.extend;
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// Set up all inheritable **Backbone.Relation** properties and methods.
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_.extend( Backbone.Relation.prototype, Backbone.Events, Backbone.Semaphore, {
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options: {
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createModels: true,
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includeInJSON: true,
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isAutoRelation: false,
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autoFetch: false
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},
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instance: null,
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key: null,
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keyContents: null,
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relatedModel: null,
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reverseRelation: null,
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related: null,
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_relatedModelAdded: function( model, coll, options ) {
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// Allow 'model' to set up its relations, before calling 'tryAddRelated'
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// (which can result in a call to 'addRelated' on a relation of 'model')
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var dit = this;
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model.queue( function() {
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dit.tryAddRelated( model, options );
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});
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},
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_relatedModelRemoved: function( model, coll, options ) {
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this.removeRelated( model, options );
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},
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_modelRemovedFromCollection: function( model ) {
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if ( model === this.instance ) {
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this.destroy();
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}
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},
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/**
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* Check several pre-conditions.
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* @return {Boolean} True if pre-conditions are satisfied, false if they're not.
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*/
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checkPreconditions: function() {
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var i = this.instance,
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k = this.key,
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m = this.model,
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rm = this.relatedModel,
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warn = Backbone.Relational.showWarnings && typeof console !== 'undefined';
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if ( !m || !k || !rm ) {
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warn && console.warn( 'Relation=%o; no model, key or relatedModel (%o, %o, %o)', this, m, k, rm );
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return false;
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}
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// Check if the type in 'model' inherits from Backbone.RelationalModel
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if ( !( m.prototype instanceof Backbone.RelationalModel ) ) {
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warn && console.warn( 'Relation=%o; model does not inherit from Backbone.RelationalModel (%o)', this, i );
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return false;
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}
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// Check if the type in 'relatedModel' inherits from Backbone.RelationalModel
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if ( !( rm.prototype instanceof Backbone.RelationalModel ) ) {
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warn && console.warn( 'Relation=%o; relatedModel does not inherit from Backbone.RelationalModel (%o)', this, rm );
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return false;
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}
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// Check if this is not a HasMany, and the reverse relation is HasMany as well
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if ( this instanceof Backbone.HasMany && this.reverseRelation.type === Backbone.HasMany ) {
|
|
warn && console.warn( 'Relation=%o; relation is a HasMany, and the reverseRelation is HasMany as well.', this );
|
|
return false;
|
|
}
|
|
|
|
// Check if we're not attempting to create a duplicate relationship
|
|
if ( i && i._relations.length ) {
|
|
var exists = _.any( i._relations || [], function( rel ) {
|
|
var hasReverseRelation = this.reverseRelation.key && rel.reverseRelation.key;
|
|
return rel.relatedModel === rm && rel.key === k &&
|
|
( !hasReverseRelation || this.reverseRelation.key === rel.reverseRelation.key );
|
|
}, this );
|
|
|
|
if ( exists ) {
|
|
warn && console.warn( 'Relation=%o between instance=%o.%s and relatedModel=%o.%s already exists',
|
|
this, i, k, rm, this.reverseRelation.key );
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
},
|
|
|
|
/**
|
|
* Set the related model(s) for this relation
|
|
* @param {Backbone.Model|Backbone.Collection} related
|
|
* @param {Object} [options]
|
|
*/
|
|
setRelated: function( related, options ) {
|
|
this.related = related;
|
|
|
|
this.instance.acquire();
|
|
this.instance.attributes[ this.key ] = related;
|
|
this.instance.release();
|
|
},
|
|
|
|
/**
|
|
* Determine if a relation (on a different RelationalModel) is the reverse
|
|
* relation of the current one.
|
|
* @param {Backbone.Relation} relation
|
|
* @return {Boolean}
|
|
*/
|
|
_isReverseRelation: function( relation ) {
|
|
if ( relation.instance instanceof this.relatedModel && this.reverseRelation.key === relation.key &&
|
|
this.key === relation.reverseRelation.key ) {
|
|
return true;
|
|
}
|
|
return false;
|
|
},
|
|
|
|
/**
|
|
* Get the reverse relations (pointing back to 'this.key' on 'this.instance') for the currently related model(s).
|
|
* @param {Backbone.RelationalModel} [model] Get the reverse relations for a specific model.
|
|
* If not specified, 'this.related' is used.
|
|
* @return {Backbone.Relation[]}
|
|
*/
|
|
getReverseRelations: function( model ) {
|
|
var reverseRelations = [];
|
|
// Iterate over 'model', 'this.related.models' (if this.related is a Backbone.Collection), or wrap 'this.related' in an array.
|
|
var models = !_.isUndefined( model ) ? [ model ] : this.related && ( this.related.models || [ this.related ] );
|
|
_.each( models || [], function( related ) {
|
|
_.each( related.getRelations() || [], function( relation ) {
|
|
if ( this._isReverseRelation( relation ) ) {
|
|
reverseRelations.push( relation );
|
|
}
|
|
}, this );
|
|
}, this );
|
|
|
|
return reverseRelations;
|
|
},
|
|
|
|
/**
|
|
* Rename options.silent to options.silentChange, so events propagate properly.
|
|
* (for example in HasMany, from 'addRelated'->'handleAddition')
|
|
* @param {Object} [options]
|
|
* @return {Object}
|
|
*/
|
|
sanitizeOptions: function( options ) {
|
|
options = options ? _.clone( options ) : {};
|
|
if ( options.silent ) {
|
|
options.silentChange = true;
|
|
delete options.silent;
|
|
}
|
|
return options;
|
|
},
|
|
|
|
/**
|
|
* Rename options.silentChange to options.silent, so events are silenced as intended in Backbone's
|
|
* original functions.
|
|
* @param {Object} [options]
|
|
* @return {Object}
|
|
*/
|
|
unsanitizeOptions: function( options ) {
|
|
options = options ? _.clone( options ) : {};
|
|
if ( options.silentChange ) {
|
|
options.silent = true;
|
|
delete options.silentChange;
|
|
}
|
|
return options;
|
|
},
|
|
|
|
// Cleanup. Get reverse relation, call removeRelated on each.
|
|
destroy: function() {
|
|
Backbone.Relational.store.getCollection( this.instance )
|
|
.unbind( 'relational:remove', this._modelRemovedFromCollection );
|
|
|
|
Backbone.Relational.store.getCollection( this.relatedModel )
|
|
.unbind( 'relational:add', this._relatedModelAdded )
|
|
.unbind( 'relational:remove', this._relatedModelRemoved );
|
|
|
|
_.each( this.getReverseRelations() || [], function( relation ) {
|
|
relation.removeRelated( this.instance );
|
|
}, this );
|
|
}
|
|
});
|
|
|
|
Backbone.HasOne = Backbone.Relation.extend({
|
|
options: {
|
|
reverseRelation: { type: 'HasMany' }
|
|
},
|
|
|
|
initialize: function() {
|
|
_.bindAll( this, 'onChange' );
|
|
|
|
this.instance.bind( 'relational:change:' + this.key, this.onChange );
|
|
|
|
var model = this.findRelated( { silent: true } );
|
|
this.setRelated( model );
|
|
|
|
// Notify new 'related' object of the new relation.
|
|
_.each( this.getReverseRelations() || [], function( relation ) {
|
|
relation.addRelated( this.instance );
|
|
}, this );
|
|
},
|
|
|
|
findRelated: function( options ) {
|
|
var item = this.keyContents;
|
|
var model = null;
|
|
|
|
if ( item instanceof this.relatedModel ) {
|
|
model = item;
|
|
}
|
|
else if ( item || item === 0 ) { // since 0 can be a valid `id` as well
|
|
model = this.relatedModel.findOrCreate( item, { create: this.options.createModels } );
|
|
}
|
|
|
|
return model;
|
|
},
|
|
|
|
/**
|
|
* If the key is changed, notify old & new reverse relations and initialize the new relation
|
|
*/
|
|
onChange: function( model, attr, options ) {
|
|
// Don't accept recursive calls to onChange (like onChange->findRelated->findOrCreate->initializeRelations->addRelated->onChange)
|
|
if ( this.isLocked() ) {
|
|
return;
|
|
}
|
|
this.acquire();
|
|
options = this.sanitizeOptions( options );
|
|
|
|
// 'options._related' is set by 'addRelated'/'removeRelated'. If it is set, the change
|
|
// is the result of a call from a relation. If it's not, the change is the result of
|
|
// a 'set' call on this.instance.
|
|
var changed = _.isUndefined( options._related );
|
|
var oldRelated = changed ? this.related : options._related;
|
|
|
|
if ( changed ) {
|
|
this.keyContents = attr;
|
|
|
|
// Set new 'related'
|
|
if ( attr instanceof this.relatedModel ) {
|
|
this.related = attr;
|
|
}
|
|
else if ( attr ) {
|
|
var related = this.findRelated( options );
|
|
this.setRelated( related );
|
|
}
|
|
else {
|
|
this.setRelated( null );
|
|
}
|
|
}
|
|
|
|
// Notify old 'related' object of the terminated relation
|
|
if ( oldRelated && this.related !== oldRelated ) {
|
|
_.each( this.getReverseRelations( oldRelated ) || [], function( relation ) {
|
|
relation.removeRelated( this.instance, options );
|
|
}, this );
|
|
}
|
|
|
|
// Notify new 'related' object of the new relation. Note we do re-apply even if this.related is oldRelated;
|
|
// that can be necessary for bi-directional relations if 'this.instance' was created after 'this.related'.
|
|
// In that case, 'this.instance' will already know 'this.related', but the reverse might not exist yet.
|
|
_.each( this.getReverseRelations() || [], function( relation ) {
|
|
relation.addRelated( this.instance, options );
|
|
}, this);
|
|
|
|
// Fire the 'update:<key>' event if 'related' was updated
|
|
if ( !options.silentChange && this.related !== oldRelated ) {
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
dit.instance.trigger( 'update:' + dit.key, dit.instance, dit.related, options );
|
|
});
|
|
}
|
|
this.release();
|
|
},
|
|
|
|
/**
|
|
* If a new 'this.relatedModel' appears in the 'store', try to match it to the last set 'keyContents'
|
|
*/
|
|
tryAddRelated: function( model, options ) {
|
|
if ( this.related ) {
|
|
return;
|
|
}
|
|
options = this.sanitizeOptions( options );
|
|
|
|
var item = this.keyContents;
|
|
if ( item || item === 0 ) { // since 0 can be a valid `id` as well
|
|
var id = Backbone.Relational.store.resolveIdForItem( this.relatedModel, item );
|
|
if ( !_.isNull( id ) && model.id === id ) {
|
|
this.addRelated( model, options );
|
|
}
|
|
}
|
|
},
|
|
|
|
addRelated: function( model, options ) {
|
|
if ( model !== this.related ) {
|
|
var oldRelated = this.related || null;
|
|
this.setRelated( model );
|
|
this.onChange( this.instance, model, { _related: oldRelated } );
|
|
}
|
|
},
|
|
|
|
removeRelated: function( model, options ) {
|
|
if ( !this.related ) {
|
|
return;
|
|
}
|
|
|
|
if ( model === this.related ) {
|
|
var oldRelated = this.related || null;
|
|
this.setRelated( null );
|
|
this.onChange( this.instance, model, { _related: oldRelated } );
|
|
}
|
|
}
|
|
});
|
|
|
|
Backbone.HasMany = Backbone.Relation.extend({
|
|
collectionType: null,
|
|
|
|
options: {
|
|
reverseRelation: { type: 'HasOne' },
|
|
collectionType: Backbone.Collection,
|
|
collectionKey: true,
|
|
collectionOptions: {}
|
|
},
|
|
|
|
initialize: function() {
|
|
_.bindAll( this, 'onChange', 'handleAddition', 'handleRemoval', 'handleReset' );
|
|
this.instance.bind( 'relational:change:' + this.key, this.onChange );
|
|
|
|
// Handle a custom 'collectionType'
|
|
this.collectionType = this.options.collectionType;
|
|
if ( _.isString( this.collectionType ) ) {
|
|
this.collectionType = Backbone.Relational.store.getObjectByName( this.collectionType );
|
|
}
|
|
if ( !this.collectionType.prototype instanceof Backbone.Collection ){
|
|
throw new Error( 'collectionType must inherit from Backbone.Collection' );
|
|
}
|
|
|
|
// Handle cases where a model/relation is created with a collection passed straight into 'attributes'
|
|
if ( this.keyContents instanceof Backbone.Collection ) {
|
|
this.setRelated( this._prepareCollection( this.keyContents ) );
|
|
}
|
|
else {
|
|
this.setRelated( this._prepareCollection() );
|
|
}
|
|
|
|
this.findRelated( { silent: true } );
|
|
},
|
|
|
|
_getCollectionOptions: function() {
|
|
return _.isFunction( this.options.collectionOptions ) ?
|
|
this.options.collectionOptions( this.instance ) :
|
|
this.options.collectionOptions;
|
|
},
|
|
|
|
/**
|
|
* Bind events and setup collectionKeys for a collection that is to be used as the backing store for a HasMany.
|
|
* If no 'collection' is supplied, a new collection will be created of the specified 'collectionType' option.
|
|
* @param {Backbone.Collection} [collection]
|
|
*/
|
|
_prepareCollection: function( collection ) {
|
|
if ( this.related ) {
|
|
this.related
|
|
.unbind( 'relational:add', this.handleAddition )
|
|
.unbind( 'relational:remove', this.handleRemoval )
|
|
.unbind( 'relational:reset', this.handleReset )
|
|
}
|
|
|
|
if ( !collection || !( collection instanceof Backbone.Collection ) ) {
|
|
collection = new this.collectionType( [], this._getCollectionOptions() );
|
|
}
|
|
|
|
collection.model = this.relatedModel;
|
|
|
|
if ( this.options.collectionKey ) {
|
|
var key = this.options.collectionKey === true ? this.options.reverseRelation.key : this.options.collectionKey;
|
|
|
|
if ( collection[ key ] && collection[ key ] !== this.instance ) {
|
|
if ( Backbone.Relational.showWarnings && typeof console !== 'undefined' ) {
|
|
console.warn( 'Relation=%o; collectionKey=%s already exists on collection=%o', this, key, this.options.collectionKey );
|
|
}
|
|
}
|
|
else if ( key ) {
|
|
collection[ key ] = this.instance;
|
|
}
|
|
}
|
|
|
|
collection
|
|
.bind( 'relational:add', this.handleAddition )
|
|
.bind( 'relational:remove', this.handleRemoval )
|
|
.bind( 'relational:reset', this.handleReset );
|
|
|
|
return collection;
|
|
},
|
|
|
|
findRelated: function( options ) {
|
|
if ( this.keyContents ) {
|
|
var models = [];
|
|
|
|
if ( this.keyContents instanceof Backbone.Collection ) {
|
|
models = this.keyContents.models;
|
|
}
|
|
else {
|
|
// Handle cases the an API/user supplies just an Object/id instead of an Array
|
|
this.keyContents = _.isArray( this.keyContents ) ? this.keyContents : [ this.keyContents ];
|
|
|
|
// Try to find instances of the appropriate 'relatedModel' in the store
|
|
_.each( this.keyContents || [], function( item ) {
|
|
var model = null;
|
|
if ( item instanceof this.relatedModel ) {
|
|
model = item;
|
|
}
|
|
else if ( item || item === 0 ) { // since 0 can be a valid `id` as well
|
|
model = this.relatedModel.findOrCreate( item, { create: this.options.createModels } );
|
|
}
|
|
|
|
if ( model && !this.related.get( model ) ) {
|
|
models.push( model );
|
|
}
|
|
}, this );
|
|
}
|
|
|
|
// Add all found 'models' in on go, so 'add' will only be called once (and thus 'sort', etc.)
|
|
if ( models.length ) {
|
|
options = this.unsanitizeOptions( options );
|
|
this.related.add( models, options );
|
|
}
|
|
}
|
|
},
|
|
|
|
/**
|
|
* If the key is changed, notify old & new reverse relations and initialize the new relation
|
|
*/
|
|
onChange: function( model, attr, options ) {
|
|
options = this.sanitizeOptions( options );
|
|
this.keyContents = attr;
|
|
|
|
// Replace 'this.related' by 'attr' if it is a Backbone.Collection
|
|
if ( attr instanceof Backbone.Collection ) {
|
|
this._prepareCollection( attr );
|
|
this.related = attr;
|
|
}
|
|
// Otherwise, 'attr' should be an array of related object ids.
|
|
// Re-use the current 'this.related' if it is a Backbone.Collection, and remove any current entries.
|
|
// Otherwise, create a new collection.
|
|
else {
|
|
var oldIds = {}, newIds = {};
|
|
|
|
if ( !_.isArray( attr ) && attr !== undefined ) {
|
|
attr = [ attr ];
|
|
}
|
|
|
|
_.each( attr, function( attributes ) {
|
|
newIds[ attributes.id ] = true;
|
|
});
|
|
|
|
var coll = this.related;
|
|
if ( coll instanceof Backbone.Collection ) {
|
|
// Make sure to operate on a copy since we're removing while iterating
|
|
_.each( coll.models.slice(0) , function( model ) {
|
|
// When fetch is called with the 'keepNewModels' option, we don't want to remove
|
|
// client-created new models when the fetch is completed.
|
|
if ( !options.keepNewModels || !model.isNew() ) {
|
|
oldIds[ model.id ] = true;
|
|
coll.remove( model, { silent: (model.id in newIds) } );
|
|
}
|
|
});
|
|
} else {
|
|
coll = this._prepareCollection();
|
|
}
|
|
|
|
_.each( attr, function( attributes ) {
|
|
var model = this.relatedModel.findOrCreate( attributes, { create: this.options.createModels } );
|
|
if (model) {
|
|
coll.add( model, { silent: (model.id in oldIds)} );
|
|
}
|
|
}, this );
|
|
|
|
this.setRelated( coll );
|
|
|
|
}
|
|
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
!options.silentChange && dit.instance.trigger( 'update:' + dit.key, dit.instance, dit.related, options );
|
|
});
|
|
},
|
|
|
|
tryAddRelated: function( model, options ) {
|
|
options = this.sanitizeOptions( options );
|
|
if ( !this.related.get( model ) ) {
|
|
// Check if this new model was specified in 'this.keyContents'
|
|
var item = _.any( this.keyContents || [], function( item ) {
|
|
var id = Backbone.Relational.store.resolveIdForItem( this.relatedModel, item );
|
|
return !_.isNull( id ) && id === model.id;
|
|
}, this );
|
|
|
|
if ( item ) {
|
|
this.related.add( model, options );
|
|
}
|
|
}
|
|
},
|
|
|
|
/**
|
|
* When a model is added to a 'HasMany', trigger 'add' on 'this.instance' and notify reverse relations.
|
|
* (should be 'HasOne', must set 'this.instance' as their related).
|
|
*/
|
|
handleAddition: function( model, coll, options ) {
|
|
//console.debug('handleAddition called; args=%o', arguments);
|
|
// Make sure the model is in fact a valid model before continuing.
|
|
// (it can be invalid as a result of failing validation in Backbone.Collection._prepareModel)
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
return;
|
|
}
|
|
|
|
options = this.sanitizeOptions( options );
|
|
|
|
_.each( this.getReverseRelations( model ) || [], function( relation ) {
|
|
relation.addRelated( this.instance, options );
|
|
}, this );
|
|
|
|
// Only trigger 'add' once the newly added model is initialized (so, has its relations set up)
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
!options.silentChange && dit.instance.trigger( 'add:' + dit.key, model, dit.related, options );
|
|
});
|
|
},
|
|
|
|
/**
|
|
* When a model is removed from a 'HasMany', trigger 'remove' on 'this.instance' and notify reverse relations.
|
|
* (should be 'HasOne', which should be nullified)
|
|
*/
|
|
handleRemoval: function( model, coll, options ) {
|
|
//console.debug('handleRemoval called; args=%o', arguments);
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
return;
|
|
}
|
|
|
|
options = this.sanitizeOptions( options );
|
|
|
|
_.each( this.getReverseRelations( model ) || [], function( relation ) {
|
|
relation.removeRelated( this.instance, options );
|
|
}, this );
|
|
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
!options.silentChange && dit.instance.trigger( 'remove:' + dit.key, model, dit.related, options );
|
|
});
|
|
},
|
|
|
|
handleReset: function( coll, options ) {
|
|
options = this.sanitizeOptions( options );
|
|
|
|
var dit = this;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
!options.silentChange && dit.instance.trigger( 'reset:' + dit.key, dit.related, options );
|
|
});
|
|
},
|
|
|
|
addRelated: function( model, options ) {
|
|
var dit = this;
|
|
options = this.unsanitizeOptions( options );
|
|
model.queue( function() { // Queued to avoid errors for adding 'model' to the 'this.related' set twice
|
|
if ( dit.related && !dit.related.get( model ) ) {
|
|
dit.related.add( model, options );
|
|
}
|
|
});
|
|
},
|
|
|
|
removeRelated: function( model, options ) {
|
|
options = this.unsanitizeOptions( options );
|
|
if ( this.related.get( model ) ) {
|
|
this.related.remove( model, options );
|
|
}
|
|
}
|
|
});
|
|
|
|
/**
|
|
* A type of Backbone.Model that also maintains relations to other models and collections.
|
|
* New events when compared to the original:
|
|
* - 'add:<key>' (model, related collection, options)
|
|
* - 'remove:<key>' (model, related collection, options)
|
|
* - 'update:<key>' (model, related model or collection, options)
|
|
*/
|
|
Backbone.RelationalModel = Backbone.Model.extend({
|
|
relations: null, // Relation descriptions on the prototype
|
|
_relations: null, // Relation instances
|
|
_isInitialized: false,
|
|
_deferProcessing: false,
|
|
_queue: null,
|
|
|
|
subModelTypeAttribute: 'type',
|
|
subModelTypes: null,
|
|
|
|
constructor: function( attributes, options ) {
|
|
// Nasty hack, for cases like 'model.get( <HasMany key> ).add( item )'.
|
|
// Defer 'processQueue', so that when 'Relation.createModels' is used we:
|
|
// a) Survive 'Backbone.Collection.add'; this takes care we won't error on "can't add model to a set twice"
|
|
// (by creating a model from properties, having the model add itself to the collection via one of
|
|
// its relations, then trying to add it to the collection).
|
|
// b) Trigger 'HasMany' collection events only after the model is really fully set up.
|
|
// Example that triggers both a and b: "p.get('jobs').add( { company: c, person: p } )".
|
|
var dit = this;
|
|
if ( options && options.collection ) {
|
|
this._deferProcessing = true;
|
|
|
|
var processQueue = function( model ) {
|
|
if ( model === dit ) {
|
|
dit._deferProcessing = false;
|
|
dit.processQueue();
|
|
options.collection.unbind( 'relational:add', processQueue );
|
|
}
|
|
};
|
|
options.collection.bind( 'relational:add', processQueue );
|
|
|
|
// So we do process the queue eventually, regardless of whether this model really gets added to 'options.collection'.
|
|
_.defer( function() {
|
|
processQueue( dit );
|
|
});
|
|
}
|
|
|
|
this._queue = new Backbone.BlockingQueue();
|
|
this._queue.block();
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
Backbone.Model.apply( this, arguments );
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
},
|
|
|
|
/**
|
|
* Override 'trigger' to queue 'change' and 'change:*' events
|
|
*/
|
|
trigger: function( eventName ) {
|
|
if ( eventName.length > 5 && 'change' === eventName.substr( 0, 6 ) ) {
|
|
var dit = this, args = arguments;
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
Backbone.Model.prototype.trigger.apply( dit, args );
|
|
});
|
|
}
|
|
else {
|
|
Backbone.Model.prototype.trigger.apply( this, arguments );
|
|
}
|
|
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Initialize Relations present in this.relations; determine the type (HasOne/HasMany), then creates a new instance.
|
|
* Invoked in the first call so 'set' (which is made from the Backbone.Model constructor).
|
|
*/
|
|
initializeRelations: function() {
|
|
this.acquire(); // Setting up relations often also involve calls to 'set', and we only want to enter this function once
|
|
this._relations = [];
|
|
|
|
_.each( this.relations || [], function( rel ) {
|
|
var type = !_.isString( rel.type ) ? rel.type : Backbone[ rel.type ] || Backbone.Relational.store.getObjectByName( rel.type );
|
|
if ( type && type.prototype instanceof Backbone.Relation ) {
|
|
new type( this, rel ); // Also pushes the new Relation into _relations
|
|
}
|
|
else {
|
|
Backbone.Relational.showWarnings && typeof console !== 'undefined' && console.warn( 'Relation=%o; missing or invalid type!', rel );
|
|
}
|
|
}, this );
|
|
|
|
this._isInitialized = true;
|
|
this.release();
|
|
this.processQueue();
|
|
},
|
|
|
|
/**
|
|
* When new values are set, notify this model's relations (also if options.silent is set).
|
|
* (Relation.setRelated locks this model before calling 'set' on it to prevent loops)
|
|
*/
|
|
updateRelations: function( options ) {
|
|
if ( this._isInitialized && !this.isLocked() ) {
|
|
_.each( this._relations || [], function( rel ) {
|
|
// Update from data in `rel.keySource` if set, or `rel.key` otherwise
|
|
var val = this.attributes[ rel.keySource ] || this.attributes[ rel.key ];
|
|
if ( rel.related !== val ) {
|
|
this.trigger( 'relational:change:' + rel.key, this, val, options || {} );
|
|
}
|
|
}, this );
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Either add to the queue (if we're not initialized yet), or execute right away.
|
|
*/
|
|
queue: function( func ) {
|
|
this._queue.add( func );
|
|
},
|
|
|
|
/**
|
|
* Process _queue
|
|
*/
|
|
processQueue: function() {
|
|
if ( this._isInitialized && !this._deferProcessing && this._queue.isBlocked() ) {
|
|
this._queue.unblock();
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Get a specific relation.
|
|
* @param key {string} The relation key to look for.
|
|
* @return {Backbone.Relation} An instance of 'Backbone.Relation', if a relation was found for 'key', or null.
|
|
*/
|
|
getRelation: function( key ) {
|
|
return _.detect( this._relations, function( rel ) {
|
|
if ( rel.key === key ) {
|
|
return true;
|
|
}
|
|
}, this );
|
|
},
|
|
|
|
/**
|
|
* Get all of the created relations.
|
|
* @return {Backbone.Relation[]}
|
|
*/
|
|
getRelations: function() {
|
|
return this._relations;
|
|
},
|
|
|
|
/**
|
|
* Retrieve related objects.
|
|
* @param key {string} The relation key to fetch models for.
|
|
* @param [options] {Object} Options for 'Backbone.Model.fetch' and 'Backbone.sync'.
|
|
* @param [update=false] {boolean} Whether to force a fetch from the server (updating existing models).
|
|
* @return {jQuery.when[]} An array of request objects
|
|
*/
|
|
fetchRelated: function( key, options, update ) {
|
|
options || ( options = {} );
|
|
var setUrl,
|
|
requests = [],
|
|
rel = this.getRelation( key ),
|
|
keyContents = rel && rel.keyContents,
|
|
toFetch = keyContents && _.select( _.isArray( keyContents ) ? keyContents : [ keyContents ], function( item ) {
|
|
var id = Backbone.Relational.store.resolveIdForItem( rel.relatedModel, item );
|
|
return !_.isNull( id ) && ( update || !Backbone.Relational.store.find( rel.relatedModel, id ) );
|
|
}, this );
|
|
|
|
if ( toFetch && toFetch.length ) {
|
|
// Create a model for each entry in 'keyContents' that is to be fetched
|
|
var models = _.map( toFetch, function( item ) {
|
|
var model;
|
|
|
|
if ( _.isObject( item ) ) {
|
|
model = rel.relatedModel.findOrCreate( item );
|
|
}
|
|
else {
|
|
var attrs = {};
|
|
attrs[ rel.relatedModel.prototype.idAttribute ] = item;
|
|
model = rel.relatedModel.findOrCreate( attrs );
|
|
}
|
|
|
|
return model;
|
|
}, this );
|
|
|
|
// Try if the 'collection' can provide a url to fetch a set of models in one request.
|
|
if ( rel.related instanceof Backbone.Collection && _.isFunction( rel.related.url ) ) {
|
|
setUrl = rel.related.url( models );
|
|
}
|
|
|
|
// An assumption is that when 'Backbone.Collection.url' is a function, it can handle building of set urls.
|
|
// To make sure it can, test if the url we got by supplying a list of models to fetch is different from
|
|
// the one supplied for the default fetch action (without args to 'url').
|
|
if ( setUrl && setUrl !== rel.related.url() ) {
|
|
var opts = _.defaults(
|
|
{
|
|
error: function() {
|
|
var args = arguments;
|
|
_.each( models || [], function( model ) {
|
|
model.trigger( 'destroy', model, model.collection, options );
|
|
options.error && options.error.apply( model, args );
|
|
});
|
|
},
|
|
url: setUrl
|
|
},
|
|
options,
|
|
{ add: true }
|
|
);
|
|
|
|
requests = [ rel.related.fetch( opts ) ];
|
|
}
|
|
else {
|
|
requests = _.map( models || [], function( model ) {
|
|
var opts = _.defaults(
|
|
{
|
|
error: function() {
|
|
model.trigger( 'destroy', model, model.collection, options );
|
|
options.error && options.error.apply( model, arguments );
|
|
}
|
|
},
|
|
options
|
|
);
|
|
return model.fetch( opts );
|
|
}, this );
|
|
}
|
|
}
|
|
|
|
return requests;
|
|
},
|
|
|
|
get: function( attr ) {
|
|
var originalResult = Backbone.Model.prototype.get.call( this, attr );
|
|
|
|
// Use `originalResult` get if dotNotation not enabled or not required because no dot is in `attr`
|
|
if ( !this.dotNotation || attr.indexOf( '.' ) === -1 ) {
|
|
return originalResult;
|
|
}
|
|
|
|
// Go through all splits and return the final result
|
|
var splits = attr.split( '.' );
|
|
var result = _.reduce(splits, function( model, split ) {
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
throw new Error( 'Attribute must be an instanceof Backbone.Model. Is: ' + model + ', currentSplit: ' + split );
|
|
}
|
|
|
|
return Backbone.Model.prototype.get.call( model, split );
|
|
}, this );
|
|
|
|
if ( originalResult !== undefined && result !== undefined ) {
|
|
throw new Error( "Ambiguous result for '" + attr + "'. direct result: " + originalResult + ", dotNotation: " + result );
|
|
}
|
|
|
|
return originalResult || result;
|
|
},
|
|
|
|
set: function( key, value, options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
// Duplicate backbone's behavior to allow separate key/value parameters, instead of a single 'attributes' object
|
|
var attributes;
|
|
if ( _.isObject( key ) || key == null ) {
|
|
attributes = key;
|
|
options = value;
|
|
}
|
|
else {
|
|
attributes = {};
|
|
attributes[ key ] = value;
|
|
}
|
|
|
|
var result = Backbone.Model.prototype.set.apply( this, arguments );
|
|
|
|
// Ideal place to set up relations :)
|
|
if ( !this._isInitialized && !this.isLocked() ) {
|
|
this.constructor.initializeModelHierarchy();
|
|
|
|
Backbone.Relational.store.register( this );
|
|
|
|
this.initializeRelations();
|
|
}
|
|
// Update the 'idAttribute' in Backbone.store if; we don't want it to miss an 'id' update due to {silent:true}
|
|
else if ( attributes && this.idAttribute in attributes ) {
|
|
Backbone.Relational.store.update( this );
|
|
}
|
|
|
|
if ( attributes ) {
|
|
this.updateRelations( options );
|
|
}
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
|
|
return result;
|
|
},
|
|
|
|
unset: function( attribute, options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
var result = Backbone.Model.prototype.unset.apply( this, arguments );
|
|
this.updateRelations( options );
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
|
|
return result;
|
|
},
|
|
|
|
clear: function( options ) {
|
|
Backbone.Relational.eventQueue.block();
|
|
|
|
var result = Backbone.Model.prototype.clear.apply( this, arguments );
|
|
this.updateRelations( options );
|
|
|
|
// Try to run the global queue holding external events
|
|
Backbone.Relational.eventQueue.unblock();
|
|
|
|
return result;
|
|
},
|
|
|
|
clone: function() {
|
|
var attributes = _.clone( this.attributes );
|
|
if ( !_.isUndefined( attributes[ this.idAttribute ] ) ) {
|
|
attributes[ this.idAttribute ] = null;
|
|
}
|
|
|
|
_.each( this.getRelations() || [], function( rel ) {
|
|
delete attributes[ rel.key ];
|
|
});
|
|
|
|
return new this.constructor( attributes );
|
|
},
|
|
|
|
/**
|
|
* Convert relations to JSON, omits them when required
|
|
*/
|
|
toJSON: function(options) {
|
|
// If this Model has already been fully serialized in this branch once, return to avoid loops
|
|
if ( this.isLocked() ) {
|
|
return this.id;
|
|
}
|
|
|
|
this.acquire();
|
|
var json = Backbone.Model.prototype.toJSON.call( this, options );
|
|
|
|
if ( this.constructor._superModel && !( this.constructor._subModelTypeAttribute in json ) ) {
|
|
json[ this.constructor._subModelTypeAttribute ] = this.constructor._subModelTypeValue;
|
|
}
|
|
|
|
_.each( this._relations || [], function( rel ) {
|
|
var value = json[ rel.key ];
|
|
|
|
if ( rel.options.includeInJSON === true) {
|
|
if ( value && _.isFunction( value.toJSON ) ) {
|
|
json[ rel.keyDestination ] = value.toJSON( options );
|
|
}
|
|
else {
|
|
json[ rel.keyDestination ] = null;
|
|
}
|
|
}
|
|
else if ( _.isString( rel.options.includeInJSON ) ) {
|
|
if ( value instanceof Backbone.Collection ) {
|
|
json[ rel.keyDestination ] = value.pluck( rel.options.includeInJSON );
|
|
}
|
|
else if ( value instanceof Backbone.Model ) {
|
|
json[ rel.keyDestination ] = value.get( rel.options.includeInJSON );
|
|
}
|
|
else {
|
|
json[ rel.keyDestination ] = null;
|
|
}
|
|
}
|
|
else if ( _.isArray( rel.options.includeInJSON ) ) {
|
|
if ( value instanceof Backbone.Collection ) {
|
|
var valueSub = [];
|
|
value.each( function( model ) {
|
|
var curJson = {};
|
|
_.each( rel.options.includeInJSON, function( key ) {
|
|
curJson[ key ] = model.get( key );
|
|
});
|
|
valueSub.push( curJson );
|
|
});
|
|
json[ rel.keyDestination ] = valueSub;
|
|
}
|
|
else if ( value instanceof Backbone.Model ) {
|
|
var valueSub = {};
|
|
_.each( rel.options.includeInJSON, function( key ) {
|
|
valueSub[ key ] = value.get( key );
|
|
});
|
|
json[ rel.keyDestination ] = valueSub;
|
|
}
|
|
else {
|
|
json[ rel.keyDestination ] = null;
|
|
}
|
|
}
|
|
else {
|
|
delete json[ rel.key ];
|
|
}
|
|
|
|
if ( rel.keyDestination !== rel.key ) {
|
|
delete json[ rel.key ];
|
|
}
|
|
});
|
|
|
|
this.release();
|
|
return json;
|
|
}
|
|
},
|
|
{
|
|
setup: function( superModel ) {
|
|
// We don't want to share a relations array with a parent, as this will cause problems with
|
|
// reverse relations.
|
|
this.prototype.relations = ( this.prototype.relations || [] ).slice( 0 );
|
|
|
|
this._subModels = {};
|
|
this._superModel = null;
|
|
|
|
// If this model has 'subModelTypes' itself, remember them in the store
|
|
if ( this.prototype.hasOwnProperty( 'subModelTypes' ) ) {
|
|
Backbone.Relational.store.addSubModels( this.prototype.subModelTypes, this );
|
|
}
|
|
// The 'subModelTypes' property should not be inherited, so reset it.
|
|
else {
|
|
this.prototype.subModelTypes = null;
|
|
}
|
|
|
|
// Initialize all reverseRelations that belong to this new model.
|
|
_.each( this.prototype.relations || [], function( rel ) {
|
|
if ( !rel.model ) {
|
|
rel.model = this;
|
|
}
|
|
|
|
if ( rel.reverseRelation && rel.model === this ) {
|
|
var preInitialize = true;
|
|
if ( _.isString( rel.relatedModel ) ) {
|
|
/**
|
|
* The related model might not be defined for two reasons
|
|
* 1. it never gets defined, e.g. a typo
|
|
* 2. it is related to itself
|
|
* In neither of these cases do we need to pre-initialize reverse relations.
|
|
*/
|
|
var relatedModel = Backbone.Relational.store.getObjectByName( rel.relatedModel );
|
|
preInitialize = relatedModel && ( relatedModel.prototype instanceof Backbone.RelationalModel );
|
|
}
|
|
|
|
var type = !_.isString( rel.type ) ? rel.type : Backbone[ rel.type ] || Backbone.Relational.store.getObjectByName( rel.type );
|
|
if ( preInitialize && type && type.prototype instanceof Backbone.Relation ) {
|
|
new type( null, rel );
|
|
}
|
|
}
|
|
}, this );
|
|
|
|
return this;
|
|
},
|
|
|
|
/**
|
|
* Create a 'Backbone.Model' instance based on 'attributes'.
|
|
* @param {Object} attributes
|
|
* @param {Object} [options]
|
|
* @return {Backbone.Model}
|
|
*/
|
|
build: function( attributes, options ) {
|
|
var model = this;
|
|
|
|
// 'build' is a possible entrypoint; it's possible no model hierarchy has been determined yet.
|
|
this.initializeModelHierarchy();
|
|
|
|
// Determine what type of (sub)model should be built if applicable.
|
|
// Lookup the proper subModelType in 'this._subModels'.
|
|
if ( this._subModels && this.prototype.subModelTypeAttribute in attributes ) {
|
|
var subModelTypeAttribute = attributes[ this.prototype.subModelTypeAttribute ];
|
|
var subModelType = this._subModels[ subModelTypeAttribute ];
|
|
if ( subModelType ) {
|
|
model = subModelType;
|
|
}
|
|
}
|
|
|
|
return new model( attributes, options );
|
|
},
|
|
|
|
initializeModelHierarchy: function() {
|
|
// If we're here for the first time, try to determine if this modelType has a 'superModel'.
|
|
if ( _.isUndefined( this._superModel ) || _.isNull( this._superModel ) ) {
|
|
Backbone.Relational.store.setupSuperModel( this );
|
|
|
|
// If a superModel has been found, copy relations from the _superModel if they haven't been
|
|
// inherited automatically (due to a redefinition of 'relations').
|
|
// Otherwise, make sure we don't get here again for this type by making '_superModel' false so we fail
|
|
// the isUndefined/isNull check next time.
|
|
if ( this._superModel ) {
|
|
//
|
|
if ( this._superModel.prototype.relations ) {
|
|
var supermodelRelationsExist = _.any( this.prototype.relations || [], function( rel ) {
|
|
return rel.model && rel.model !== this;
|
|
}, this );
|
|
|
|
if ( !supermodelRelationsExist ) {
|
|
this.prototype.relations = this._superModel.prototype.relations.concat( this.prototype.relations );
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
this._superModel = false;
|
|
}
|
|
}
|
|
|
|
// If we came here through 'build' for a model that has 'subModelTypes', and not all of them have been resolved yet, try to resolve each.
|
|
if ( this.prototype.subModelTypes && _.keys( this.prototype.subModelTypes ).length !== _.keys( this._subModels ).length ) {
|
|
_.each( this.prototype.subModelTypes || [], function( subModelTypeName ) {
|
|
var subModelType = Backbone.Relational.store.getObjectByName( subModelTypeName );
|
|
subModelType && subModelType.initializeModelHierarchy();
|
|
});
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Find an instance of `this` type in 'Backbone.Relational.store'.
|
|
* - If `attributes` is a string or a number, `findOrCreate` will just query the `store` and return a model if found.
|
|
* - If `attributes` is an object and is found in the store, the model will be updated with `attributes` unless `options.update` is `false`.
|
|
* Otherwise, a new model is created with `attributes` (unless `options.create` is explicitly set to `false`).
|
|
* @param {Object|String|Number} attributes Either a model's id, or the attributes used to create or update a model.
|
|
* @param {Object} [options]
|
|
* @param {Boolean} [options.create=true]
|
|
* @param {Boolean} [options.update=true]
|
|
* @return {Backbone.RelationalModel}
|
|
*/
|
|
findOrCreate: function( attributes, options ) {
|
|
options || ( options = {} );
|
|
var parsedAttributes = (_.isObject( attributes ) && this.prototype.parse) ? this.prototype.parse( attributes ) : attributes;
|
|
// Try to find an instance of 'this' model type in the store
|
|
var model = Backbone.Relational.store.find( this, parsedAttributes );
|
|
|
|
// If we found an instance, update it with the data in 'item' (unless 'options.update' is false).
|
|
// If not, create an instance (unless 'options.create' is false).
|
|
if ( _.isObject( attributes ) ) {
|
|
if ( model && options.update !== false ) {
|
|
model.set( parsedAttributes, options );
|
|
}
|
|
else if ( !model && options.create !== false ) {
|
|
model = this.build( attributes, options );
|
|
}
|
|
}
|
|
|
|
return model;
|
|
}
|
|
});
|
|
_.extend( Backbone.RelationalModel.prototype, Backbone.Semaphore );
|
|
|
|
/**
|
|
* Override Backbone.Collection._prepareModel, so objects will be built using the correct type
|
|
* if the collection.model has subModels.
|
|
*/
|
|
Backbone.Collection.prototype.__prepareModel = Backbone.Collection.prototype._prepareModel;
|
|
Backbone.Collection.prototype._prepareModel = function ( attrs, options ) {
|
|
var model;
|
|
|
|
if ( attrs instanceof Backbone.Model ) {
|
|
if ( !attrs.collection ) {
|
|
attrs.collection = this;
|
|
}
|
|
model = attrs;
|
|
}
|
|
else {
|
|
options || (options = {});
|
|
options.collection = this;
|
|
|
|
if ( typeof this.model.findOrCreate !== 'undefined' ) {
|
|
model = this.model.findOrCreate( attrs, options );
|
|
}
|
|
else {
|
|
model = new this.model( attrs, options );
|
|
}
|
|
|
|
if ( !model._validate( attrs, options ) ) {
|
|
model = false;
|
|
}
|
|
}
|
|
|
|
return model;
|
|
};
|
|
|
|
|
|
/**
|
|
* Override Backbone.Collection.add, so objects fetched from the server multiple times will
|
|
* update the existing Model. Also, trigger 'relational:add'.
|
|
*/
|
|
var add = Backbone.Collection.prototype.__add = Backbone.Collection.prototype.add;
|
|
Backbone.Collection.prototype.add = function( models, options ) {
|
|
options || (options = {});
|
|
if ( !_.isArray( models ) ) {
|
|
models = [ models ];
|
|
}
|
|
|
|
var modelsToAdd = [];
|
|
|
|
//console.debug( 'calling add on coll=%o; model=%o, options=%o', this, models, options );
|
|
_.each( models || [], function( model ) {
|
|
if ( !( model instanceof Backbone.Model ) ) {
|
|
// `_prepareModel` attempts to find `model` in Backbone.store through `findOrCreate`,
|
|
// and sets the new properties on it if is found. Otherwise, a new model is instantiated.
|
|
model = Backbone.Collection.prototype._prepareModel.call( this, model, options );
|
|
}
|
|
|
|
if ( model instanceof Backbone.Model && !this.get( model ) && !this.get( model.cid ) ) {
|
|
modelsToAdd.push( model );
|
|
}
|
|
}, this );
|
|
|
|
// Add 'models' in a single batch, so the original add will only be called once (and thus 'sort', etc).
|
|
if ( modelsToAdd.length ) {
|
|
add.call( this, modelsToAdd, options );
|
|
|
|
_.each( modelsToAdd || [], function( model ) {
|
|
this.trigger( 'relational:add', model, this, options );
|
|
}, this );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.remove' to trigger 'relational:remove'.
|
|
*/
|
|
var remove = Backbone.Collection.prototype.__remove = Backbone.Collection.prototype.remove;
|
|
Backbone.Collection.prototype.remove = function( models, options ) {
|
|
options || (options = {});
|
|
if ( !_.isArray( models ) ) {
|
|
models = [ models ];
|
|
}
|
|
else {
|
|
models = models.slice( 0 );
|
|
}
|
|
|
|
//console.debug('calling remove on coll=%o; models=%o, options=%o', this, models, options );
|
|
_.each( models || [], function( model ) {
|
|
model = this.get( model ) || this.get( model.cid );
|
|
|
|
if ( model instanceof Backbone.Model ) {
|
|
remove.call( this, model, options );
|
|
this.trigger('relational:remove', model, this, options);
|
|
}
|
|
}, this );
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.reset' to trigger 'relational:reset'.
|
|
*/
|
|
var reset = Backbone.Collection.prototype.__reset = Backbone.Collection.prototype.reset;
|
|
Backbone.Collection.prototype.reset = function( models, options ) {
|
|
reset.call( this, models, options );
|
|
this.trigger( 'relational:reset', this, options );
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.sort' to trigger 'relational:reset'.
|
|
*/
|
|
var sort = Backbone.Collection.prototype.__sort = Backbone.Collection.prototype.sort;
|
|
Backbone.Collection.prototype.sort = function( options ) {
|
|
sort.call( this, options );
|
|
this.trigger( 'relational:reset', this, options );
|
|
|
|
return this;
|
|
};
|
|
|
|
/**
|
|
* Override 'Backbone.Collection.trigger' so 'add', 'remove' and 'reset' events are queued until relations
|
|
* are ready.
|
|
*/
|
|
var trigger = Backbone.Collection.prototype.__trigger = Backbone.Collection.prototype.trigger;
|
|
Backbone.Collection.prototype.trigger = function( eventName ) {
|
|
if ( eventName === 'add' || eventName === 'remove' || eventName === 'reset' ) {
|
|
var dit = this, args = arguments;
|
|
|
|
if (eventName === 'add') {
|
|
args = _.toArray( args );
|
|
// the fourth argument in case of a regular add is the option object.
|
|
// we need to clone it, as it could be modified while we wait on the eventQueue to be unblocked
|
|
if (_.isObject( args[3] ) ) {
|
|
args[3] = _.clone( args[3] );
|
|
}
|
|
}
|
|
|
|
Backbone.Relational.eventQueue.add( function() {
|
|
trigger.apply( dit, args );
|
|
});
|
|
}
|
|
else {
|
|
trigger.apply( this, arguments );
|
|
}
|
|
|
|
return this;
|
|
};
|
|
|
|
// Override .extend() to automatically call .setup()
|
|
Backbone.RelationalModel.extend = function( protoProps, classProps ) {
|
|
var child = Backbone.Model.extend.apply( this, arguments );
|
|
|
|
child.setup( this );
|
|
|
|
return child;
|
|
};
|
|
})();
|