Simple question from a newbie seeking help from the gods

Just trying to update a single field within a function called from its
associated model:

I'm calling 'removeFromGroup' in Ingredients controller from my
IngredientGroups controller.

I basically want to remove the ingredient from the group, so set the
ingredient_group_id to null.

function removeFromGroup($id = null, $group_id = null) {
if (!$id) {
$this->Session->setFlash(__('Invalid id for Ingredient', true));
$this->redirect(array('controller'=> 'IngredientGroups',
'action'=>'view', $group_id));
}

$this->data = $this->Ingredient->read(null, $id);

$this->data['ingredient_group_id'] = null;
$this->Ingredient->save($this->data);
$this->redirect(array('controller'=> 'IngredientGroups',
'action'=>'view', $group_id));

}

There's my function. It just won't save the ingredient_group_id to
null. Not sure what I'm doing wrong. Thanks!

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