title: ActiveRecord::DangerousAttributeError doesn't go away in the test
body: <p>I created a model with a column named <code>errors</code> and when I ran the test I naturally got an <code>ActiveRecord::DangerousAttributeError</code></p>
  
  <p>so I rolled back the migration and changed the column name to <code>error_messages</code> and reran the migration. I don't refer to that column yet in any other part of my code.</p>
  
  <p>Now I can create valid objects from this model in the rails console, but still the test is giving the same error. How do I make this error go away?</p>