title: Passing string and variables into a directive attribute.
body: <p>I'm trying to pass a dynamic query string into a directive that will filter the results that come back. So my code looks like this:</p>
  
  <p>So say in my controller I have this:</p>
  
  <pre><code>var ctrlAs = this;
  ctrlAs.location = "USA";
  </code></pre>
  
  <p>then in my html I have a directive:</p>
  
  <pre><code>&lt;directive filter="location=ctrlAs.location"&gt;
  </code></pre>
  
  <p>THen in my directive i'm bringing in location like "=filter". I would expect the output in the directive to be "location=USA", but instead the output in the directive is just "USA".</p>
  
  <p>Any suggestions on what i'm doing wrong?</p>