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  • Add an explicit onchange to warn about invalid values in Odoo9

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    Onchange is the most important function for Odoo. similar to a negative number of seats, or more participants than seats. For example you can see below code.

            r.taken_seats = 0.0
                else:
                    r.taken_seats = 100.0 * len(r.attendee_ids) / r.seats
    @api.onchange('seats', 'attendee_ids')
    def _verify_valid_seats(self):
        if self.seats < 0:
            return {
                'warning': {
                    'title': "Incorrect 'seats' value",
                    'message': "The number of available seats may not be negative",
                },
            }
        if self.seats < len(self.attendee_ids):
            return {
                'warning': {
                    'title': "Too many attendees",
                    'message': "Increase seats or remove excess attendees",
                },
            }
    

    Note-The taken_seats progressbar is automatically updated.

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