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    <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 &amp;&amp; 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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    1. POHow To Change Backbone Dynamic URL with Backbone Events/Vent?
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    1. USDavid Sulc
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    1. COThanks for replying. I tried this out, but unfortunately im unable to use any variable or object declared outside of the URL function. For example when I try to use 'this.user.id' console.log say 'UNDEFINED', even though it gives a value outside of the URL function. I edited my question above with a picture and my full code in case it helps. Secondly I looked into the filtered collection, so decided that may be another way. btw I checked out your book and tutorials the other day, they've been a great help.
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