Ruby on Rails

Thanks all for your reply. I understand the method you mentioned, but it doesn't work for this case (Comment is an associated class with Blog). Here is the code of _form.html.erb in views/comments folder:

  1
  2 <%= form_with(model: [@article, @article.comments.build], local: true) do |form| %>
  3   <% if @article.errors.any? %>
  4     <div id="error_explanation">
  5       <h2>
  6         <%= pluralize(@article.errors.count, "error") %> prohibited this article from being saved:
  7       </h2>
  8       <ul>   
  9               <% @article.errors.full_messages.each do |msg| %>
 10                       <li>    <%= msg %> </li>
 11               <% end %>
 12       </ul>  
 13   <% end %>
 14
 15         <p>    
 16                 <%= form.label :commenter %><br>
 17                 <%= form.text_field :commenter %>
 18         </p>
 19         <p>    
 20                 <%= form.label :body %><br>
 21                 <%= form.text_area :body %>
 22         </p>
 23         <p>    
 24                 <%= form.submit %>
 25         </p>
 26 <% end %>
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Please let me know if you need more information.

Thanks and Regards,

Jason