form_for_private_message

gistfile1.rb

<div class='well'>
  <%= form_for @private_message, url: private_messages_user_path(@user) do |f| %>
   <div class="control-group">
    <%= f.label :receiver_uid %>
  </div>
  <div class="control-group">
	  <%= f.label :subject %>
	  <%= f.text_field :subject  %>
  </div>
  <div class="control-group">
    <%= f.label :body %>
    <%= f.text_area :body, rows: 5  %>
  </div>
  <%= f.submit 'Send Message', class: 'btn btn-primary'%>
    <%end%>
	</div>
</div>