[Rails] Creating form for associated has_many model

This example shows how to create a form for an associated model
'Comment', where 'Comment' belongs_to 'Post' and 'Post has_many
'Comments'.

http://edgeguides.rubyonrails.org/getting_started.html#generating-a-controller

How might I modify that to display all the comments in the form, and
still have it call the CommentsController (versus having the form call
the PostsController, as in the example here http://railscasts.com/episodes/17-habtm-checkboxes)?

Thanks

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