updating habtm data with empty data (delete existing associations)

Hi there ...

so let's say I have

Cake habtm Ingredient

and

Ingredient habmt Cake

If I was to prep $data such as

[Cake][id] => 1
[Ingredient] => array(1, 2, 3)

and did a

Cake->save($data)

this would delete any existing associating records in the join table
between these two models and
then associate Ingredients with id 1,2,3 to Cake record with id 1 ...

To save on code, I am trying to spit the contents of my form generated
posted data array
straight to a model, but am not sure how to handle it if the
associated model data is empty.

(i.e where originally I had Ingredients 1,2,3 associated with Cake id
1, I would just want to
feed some data back so that a simple Cake->save($data) would delete
the existing associations.

I have tried

[Cake][id] => 1
[Ingredient] => null

and

[Cake][id] => 1
[Ingredient] => array()

but it just retains the currently stored associations.

I know I can catch a lack of associated Ingredients in the controller
and manually delete the
related records in the join table, but I would like to know if there
is an easier (well less code) way of doing this as sugested above?

cheers

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