title: Ember computed properties with arguments
body: <p>I was wondering if it was possible to add arguments to a computed properties. So far, everything I tried resulted in errors and found nothing on the subject. I want to build a URL using a value that is not included in my model.</p>
  
  <p>I'm looking for something that would look like this : </p>
  
  <pre><code>// App.js
  App.Image = DS.Model.extend({
      image_path_sh: DS.attr(), // image.jpg
      image_size_nm: DS.attr(), // 234234
      image_alt_sh: DS.attr(), // My image
      image_abs_url: function(width, height) {
          return "http://localhost/images/" + this.get('image_path_sh') + "/" + width "x" + height
      }.property('image_path_sh')
  });
  
  // index.html
  // I know this doesn't work, but I'd like to have something that easy to use
  {{#each image}}
      &lt;img src="{{image_abs_url 250 250}}" alt="{{image_alt_sh}}" /&gt;
  {{/each}}
  </code></pre>
  
  <p>My server will return an image that is resized. I don't want to put that in my database because these are not fixed value.</p>