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    <p>I guess that the <code>[@post, @post.comments.build]</code> array is just passed to <code>polymorphic_path</code> inside <code>form_for</code>. This generates a sub-resource path for comments (like <code>/posts/1/comments</code> in this case). So it looks like your first example uses comments as sub-resources to posts, right?. </p> <p>So actually the controller that will be called here is the <code>CommentsController</code>. The reason why Lukas' solution doesn't work for you might be that you actually don't use @post.comments.build inside the controller when creating the comment (it doesn't matter that you use it in the view when calling <code>form_for</code>). The <code>CommentsController#create</code> method should look like this (more or less):</p> <pre><code>def create @post = Post.find(params[:post_id] @comment = @post.comments.build(params[:comment]) if(@comment.save) # you would probably redirect to @post else # you would probably render post#show or wherever you have the form end end </code></pre> <p>Then you can use the code generated by scaffolding, only replace <code>@post</code> instance variable with <code>@comment</code> in all the lines except <code>form_for</code> call.</p> <p>I think it may also be a good idea to add the <code>@comment = @post.comment.build</code> to the controller method that displays this form and use <code>form_for([@post, @comment], ...)</code> to keep the form contents displayed in the form if there're errors.</p> <p>If this doesn't work and you're not able to figure it out, please add your <code>CommentsController#create</code> method to the question.</p>
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