Hello, I have a simple form to edit my category model. My category
model is using the Tree behavior. When trying to edit/update my
model's parent_id if the value is 0 it is being submitted as NULL into
the database. The database type is integer.

I am looking for a solution to preserve the initial value of 0 (zero).

If I do a pr($this->data) it shows the correct values but when I look
in the SQL log I can see that NULL is being submitted.

 Array
(
    [Category] => Array
        (
            [parent_id] => 0
            [name] => Apparel
            [description] =>
        )

)

SQL LOG
UPDATE `categories` SET `parent_id` = NULL, `name` = 'Apparel',
`description` = '', `modified` = '2008-12-12 14:27:13' WHERE
`categories`.`id` = 7

Also it works fine if the value is not 0.

Thanks in advance for any help.

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