title: how to remove active record object from array
body: <p>I have set of active record object in array.</p>
  
  <p>I just want to delete on object from array not in database</p>
  
  <pre><code>a = Model.limit(2)
  
  b = Model.first
  
  a.delete(b)
  </code></pre>
  
  <p>returning nil value</p>
  
  <p>Its not deleting</p>
  
  <p>is there anyway?</p>