@api.depends() 作用在定义需要计算的字段里定义的函数，用来指定哪些字段参与计算
taken_seats = fields.Float(string="Taken seats", compute='_taken_seats')
@api.depends('seats', 'attendee_ids')
def _taken_seats(self):
for r in self:
if not r.seats:
r.taken_seats = 0.0
else:
r.taken_seats = 100.0 * len(r.attendee_ids) / r.seats
@onchange()作用在指定的字段，当指定字段的值发生变化的时候触发被修饰的函数执行
@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",
},
}
@api.constrains()约束修饰器，用来校验。
@api.constrains('instructor_id', 'attendee_ids')
def _check_instructor_not_in_attendees(self):
for r in self:
if r.instructor_id and r.instructor_id in r.attendee_ids:
raise exceptions.ValidationError("A session's instructor can't be an attendee")
@api.multi重写父类函数