Hi all,

My code is as blow,if self.user_id has values, return domain works,but if self.user_id is False, return domain does't work.

Can anyone help me? Thanks in advance.

@api.onchange('action_id')
def _onchange_action_id(self):
    dfs_group_id = self.env.ref('sps_base.group_dfs_user')    

    if self.action_id and self.action_id.type == "dfs":
        self.user_id = self.product_template_id.owner_dfs

        return {
            'domain': {
                'user_id': [('id', 'in', [x.id for x in dfs_group_id.mapped('users')])]
            }
        }