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copied!<p>I think what you want, is to define <code>url</code> as a function, and have a <code>user</code> attribute on your collection:</p> <pre><code>var UniqueArticles = Backbone.Collection.extend({ model: Article, initialize: function(){ var self = this; myApp.vent.on("showarticles", function(someuser){ self.user = someuser; self.fetch(); } }, url : function(){ var fragment = '/api/visitingarticles/'; if(this.user && this.user.id){ return fragment + this.user.id; } return fragment; } }); </code></pre> <p>(Disclaimer: untested code, but it works in my head :D)</p> <p>Then each time you trigger the event, the <code>user</code>attribute is updated, the collection is reset with the updated url.</p> <p>As a side note, you might want to look into using a filtered collection. I've implemented that idea in my book, based on Derick Bailey's code here: <a href="http://jsfiddle.net/derickbailey/7tvzF/" rel="nofollow">http://jsfiddle.net/derickbailey/7tvzF/</a></p> <p>Here is my version: <a href="https://github.com/davidsulc/marionette-gentle-introduction/blob/master/assets/js/entities/common.js" rel="nofollow">https://github.com/davidsulc/marionette-gentle-introduction/blob/master/assets/js/entities/common.js</a></p> <p>And an example of its use (lines 38-41): <a href="https://github.com/davidsulc/marionette-gentle-introduction/blob/master/assets/js/apps/contacts/list/list_controller.js#L38" rel="nofollow">https://github.com/davidsulc/marionette-gentle-introduction/blob/master/assets/js/apps/contacts/list/list_controller.js#L38</a></p>

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