title: Rails Admin modify list/show view to add new/customized column
body: <p>I have setup the rails_admin for the admin interface of my site.</p>
  
  <p>For one of the Model, I want to display an additional column.</p>
  
  <p>say i have name , phone , email, image url, rank etc attributes in my Model(say Student).
  Then I have to display columns : <strong>Name | Rank | Preview(additional column)</strong></p>
  
  <p>In the preview column i want to display some rendered html on the basis of attributes ( email,image,url etc.) for each 'student'.</p>
  
  <p>I have found the way to include a partial for edit/update/create  to provide fields/forms as per our partial. But the same implementation of including partial is failing in list/show. </p>
  
  <p>So is there any way I can add the partial to show rendered content, in list/show view for a model...?</p>
  
  <p><strong>Edit: Code added</strong></p>
  
  <pre><code>config.model Utility do
     list do
       field :code
       field :priority
       field :name
       field :url
       field :phone
       field :logo
       field :content
       sort_by :priority
       items_per_page 100
     end
  end
  </code></pre>
  
  <p>This shows up following columns in <strong>rails_admin</strong></p>
  
  <p><strong>Code | Priority | Name | Url | Phone | Logo | Content</strong></p>
  
  <p>what i want is 
  <strong>Code | Priority | Preview</strong></p>
  
  <p>in which in Preview column i want to show a html rendering content as :</p>
  
  <p><em>blah.html (just for e.g. html for example , here i want to render in a way it is displayed in one of pages, so it is presentable for admin view too)</em></p>
  
  <pre><code>&lt;div class="blah"&gt;
    &lt;%=util.name%&gt; &lt;%=util.phone%&gt; &lt;%=util.logo%&gt; #usage with proper divs/tags/rendering
  &lt;/div &gt;
  </code></pre>