title: Grocery crud hidden field and set relation didnt work together
body: <p>I have a problem with grocery crud hidden field and set relation . </p>
  
  <p>My code is </p>
  
  <pre><code>$crud-&gt;set_relation('created_by','users','user_name'); 
  $crud-&gt;edit_fields('title', 'description', 'created_by');
  $crud-&gt;change_field_type('created_by', 'hidden', $this-&gt;user_id);
  </code></pre>
  
  <p>Here i want to store user_id as created by in hidden form. But problem is that created_by field is still visible in my view page. when I cut off set_relation then created_by field is hidden. What's problem ? plz help me </p>