title: simple_form_for not showing fields
body: <p>I have a model (Project), in the 'new' action I have this code</p>
  
  <pre><code>&lt;h1&gt;Create new project&lt;/h1&gt;
  &lt;% simple_form_for @project, :url =&gt; create_project_path  do |project_form| %&gt;
  &lt;%= project_form.error_messages %&gt;
  &lt;ul&gt;
      &lt;% project_form.input :name %&gt;
      &lt;% project_form.input :subdomain %&gt;
  
      &lt;% project_form.input :allow_email_report_client %&gt;
      &lt;% project_form.input :allow_email_post_client %&gt;
  
      &lt;% project_form.submit %&gt;
  &lt;/ul&gt;
     &lt;% end%&gt;
  </code></pre>
  
  <p>the controller code is simple
  I have a <code>load_and_authorize_resource</code> (using CanCan) and the action code is this</p>
  
  <pre><code>def new
  @project = Project.new
  end
  </code></pre>
  
  <p>now, I do get a  tag rendered but no fields inside this form</p>
  
  <p>I have the exact same thing for Account model and there all of the fields are shown with no problem.</p>
  
  <p>does anyone have an idea what is the problem?</p>