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POUpdating a collection using fetch with backbone
 

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    <p>Based on the official documentation, when I do something like this:</p> <pre><code>collection.fetch({update: true, remove: false}) </code></pre> <p>I get an "add" event for every new model, and a "change" event for every changed existing model, without removing anything.</p> <p>Why if I'm calling an static source of data (the url of the collection always return the same json) an add event is called for each item received?</p> <p>Here some code (I'm not rendering anything, I'm just debugging):</p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;head&gt; &lt;title&gt;Example&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;a href="#refresh"&gt;Refresh&lt;/a&gt; &lt;script src="js/jquery-1.8.3.min.js"&gt;&lt;/script&gt; &lt;script src="js/underscore-min.js"&gt;&lt;/script&gt; &lt;script src="js/backbone-min.js"&gt;&lt;/script&gt; &lt;script src="js/main.js"&gt;&lt;/script&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>Heres the JS</p> <pre><code>(function($){ //Twitter Model ModelsTwitt = Backbone.Model.extend({}); //Twitter Collection CollectionsTwitts = Backbone.Collection.extend({ model:ModelsTwitt, initialize:function(){ console.log('Twitter App Started'); }, url:'data/195.json' }); //Twitts View ViewsTwitts = Backbone.View.extend({ el:$('#twitter-list'), initialize:function(){ _.bindAll(this, 'render'); this.collection.bind('reset',this.render); this.collection.bind('add',this.add); }, render:function(){ console.log("This is the collection",this.collection); }, add:function(model){ console.log("add event called",model); } }); //Twitter Router Router = Backbone.Router.extend({ routes:{ '':'defaultRoute',//Default list twitts route 'refresh':'refreshView' }, defaultRoute:function(){ this.twitts = new CollectionsTwitts(); new ViewsTwitts({collection:this.twitts}); this.twitts.fetch(); }, refreshView:function(){ this.twitts.fetch({update:true,remove:false}); } }); var appRouter = new Router(); Backbone.history.start(); })(jQuery); </code></pre> <p>Basically, I fetch the collection using the defaultroute, it is fetched properly with all the models and attributes.</p> <p>And when I click on the refresh link, I call refreshView, which basically tries to update the collection with new models. What I don't understand is why if the response is the same, all the models of the collection are detected as new, triggering an <em>add</em>?</p> <p><a href="https://googledrive.com/host/0B2e89I7TTTCjdnhwaEZtdkpzZnc/index.html" rel="noreferrer">Heres a functional link:</a> open the console and you will see how the add events are called when you click on refresh even when the collection is the same.</p> <p>Thanks for your help.</p>
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