Accessing things in $this->request->data

In my ItemsController I'm editing an item and then want to redirect back to the category that the item is in but I'm not sure how to access the category_id that is in $this->request->data

My controller function (edited down to the relevant lines only) is...


public function admin_edit($id = null) {
if ($this->request->is('post') || $this->request->is('put')) {
if ($this-> Item->save($this->request->data)) {
$this->Session->setFlash(__('The Item has been saved'));
$this->redirect(array('controller' => 'categories', 'action' => 'view', *********));
}
}
}


Where I have ******* I need something like…

$this->request-> Item->category_id

...to pull the category_id out but I can't get the correct syntax to use

The category_id is in there as it is being saved with all the other item data.

I'm on CakePHP 2.3.x if that is relevant.

Regards

Paul

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