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13970170
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0
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0
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0
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2012-12-20T10:34:21.857
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2012-12-20T10:34:21.857
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0
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2012-12-20T10:43:38.760
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2012-12-20T10:43:38.760
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1721248
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1721248
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11145159
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2
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0
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text
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After use @reconbot solution I've found it brokes the instanceof operator: <pre><code>(new CoolModel) instanceof CoolModel // FALSE!!! </code></pre> And <pre><code>var MyModel = Backbone.Model.extend({ idAttribute: 'myId' }); new MyModel({ myId: 1 }) === new MyModel({ myId: 1 }) // FALSE! </code></pre> I've developed a new version who uses model's own id property (via idAttribute) and works with instanceof and allows you to extend the factory: <a href="http://jsfiddle.net/amatiasq/N5tRZ/16/" rel="nofollow">FIDDLE</a> <pre><code>function makeStoreable(model) { var store = {}; var idField = model.prototype.idAttribute; function ModelFactory(attr, opt) { if (!attr || !(idField in attr)) { throw new Error('Cool Models always have IDs!'); } var id = attr[idField]; if (store.hasOwnProperty(id)) { store[id].set(attr, opt); } else { model.call(this, attr, opt); store[id] = this; } return store[id]; } function intermediate() {} intermediate.prototype = model.prototype; ModelFactory.prototype = new intermediate; // Only EcmaScript5! // ModelFactory.extend = model.extend.bind(model); ModelFactory.extend = function() { return model.extend.apply(model, arguments); }; return ModelFactory; } </code></pre> And the test: <pre><code>var RareID = Backbone.Model.extend({ idAttribute: '_myOwnServerId' }); RareID = makeStoreable(RareID); var a = new RareID({ _myOwnServerId: 4, coolFactor: 'LOW' }); var b = new RareID({ _myOwnServerId: 4, coolFactor: 'HIGH' }); console.log(a===b); //true! console.log(a instanceof RareID); //true! console.log(a.get('coolFactor') === 'HIGH'); //true! </code></pre> :)
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1. POImplement javascript instance store by returning existing instance from constructor
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1. PTAnswer
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1. USA. Matías Quezada
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1. USA. Matías Quezada
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