Form drop down - how to add a NULL value

Hi

Fairly new to developing in cakePHP and run into a problem that I
can't see a simple solution for.

I have a model that has 2 forigen id's. In some cases, I do not want
to save anything in one of these id fields.

I want to give the user a drop down option which reads something like
'None', and that this in turn will set the id field to NULL when it is
inserted into the database.

How would I go about achieving this using cakePHP and the Form Helper?

Thanks

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