Re: error code from delete or beforeDelete?

Throw OutOfBoundsException somewhere and catch it from outside, or create your own exception http://book.cakephp.org/2.0/en/development/exceptions.html#creating-your-own-application-exceptions

Also, read better beforeDelete() callback for your example:

public function beforeDelete($cascade = true) {
    if ($this->Product->hasAny(array('product_category_id' => $this->id))) {
        return false;
    }
    return parent::beforeDelete($cascade);
}

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