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copied!<p>I think you're going about this in the wrong way. </p> <p><strong>First: I really hope that you're not calling a model <code>Thread</code>, as that would conflict with the Ruby class <code>Thread</code>. If you are, choose a different word</strong>.</p> <p>Now with the "please aim the gun <em>away</em> from your foot" message out of the way...</p> <hr> <p>You shouldn't be calling out to the <code>MessagesController</code> to create a new message for the controller. Instead, you should be using nested attributes in the new thread form:</p> <pre><code><%= form_for @thread do |f| %> <%= f.fields_for :messages do |message| %> <%= render "messages/form", :message => message %> <% end %> <% end %> </code></pre> <p>Inside your <code>DiscussionThread</code> (I am assuming the name of it here) model, you would then have these lines:</p> <pre><code>has_many :messages accepts_nested_attributes_for :messages </code></pre> <p>You may have to add <code>messages_attributes</code> to the <code>attr_accessible</code> attributes in this model too.</p> <p>This tells the <code>DiscussionThread</code> model that instances can accept attributes for the <code>messages</code> association too. In your <code>ThreadsController</code> the action would then remain the same.</p> <p>For more information about nested attributes, I recommend watching the Railscasts on <a href="http://railscasts.com/episodes/196-nested-model-form-part-1" rel="nofollow">Nested Forms #1</a> and <a href="http://railscasts.com/episodes/197-nested-model-form-part-2" rel="nofollow">Nested Forms #2</a>.</p>

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