Redirect depending on form field

I am trying to get page redirected (after add or edit) depending on a
field of the form. Here is what I have done so far:

View:
...
$back_link = array('action' => 'browse', $this->Form-
>value('Post.parent_id'));
echo $this->Form->hidden('redirect_id', array('value' =>
json_encode($back_link)));
...

Controller:
...
$redirect = (array)json_decode($this->data['redirect_id']);
$this->redirect($redirect);
...

When I pr() the $redirect , everything looks just as it should but i
get redirected to the browse action without any id after it.
How to make this working, is it necessary to use separated fields in
the view for controller, action, id. Or if you can advise any other,
more simple method to do this. Thanks

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