How to change contact's owner(user_id) along with his parent customer?

Question

I want to change contact's owner(res.partner's user_id field) along with its parent customer when changing this customer's salesperson.
I tried onchange function and compute field, but no luck.
Any help or suggestion?
I am using odoo v8.

jianxin · Answer

The solution is easier than i thought from the beginning
I just overrided write() method, just as below:
@api.multi
def write(self, vals):
super(res_partner, self).write(vals)
if 'user_id' in vals.keys():
for contact in self.child_ids:
contact.write(vals)
return True

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