title: IsValid and Ember-data
body: <p>Can somebody tell me the purpose of isValid in ember-data.</p>
  
  <p>I am trying to use this example to display either error messages or success messages to the user:</p>
  
  <p><a href="http://grosser.it/2012/05/05/save-validation-callbacks-for-ember-dataember-js/" rel="nofollow">http://grosser.it/2012/05/05/save-validation-callbacks-for-ember-dataember-js/</a></p>
  
  <p>The problem is that when I return a 422 from the server, the code does make it back to the observers.</p>
  
  <p>Also isValid is always true.</p>
  
  <p>I am really struggling to get an error notification when something goes wrong.</p>
  
  <p>I could use didCreate or didUpdate but this still leaves a hole in the error condition.</p>