Passing data from the view to the controller

I am trying to add a comments area to a simple blog application and I
would like to pass the id of a specific blog post to the comments
controller.

The only example I can find involves setting a hidden form field and
passing it via the form data...

echo $form->hidden('Comment.post_id', array('value' => $post['Post']
['id']));

Is there any other way to pass the contents of $post['Post']['id'] to
the comments controller?

The reason I am concerned about this method is (correct me if i'm
wrong) it is possible to manipulate the client side of html forms -
such as the post id to be passed via html form data therefore a user
could tell their browser to add a comment to ANY post id.

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