[Rails] "Create" form in another Controller's "show" view

This seems like a really obvious question, but I'm blanking on the
solution. I have a simple post/comments relationship that fits the
basic blog model. That means that the form to create a new comment is
in the show action in the Posts controller, but the form links to the
create action in the Comments controller. My question is basically: is
this the best way to model that relationship? The problem I'm running
into is that when posting a comment fails due to missing fields, you
can't easily "render :action => 'new'" to retain the values while
displaying an error message.

What am I missing?

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