xml - How to create domain filter for one2many field in odoo? -


i create state names , create few cities , assign state karnatak-bangalore karnatak-mangalore
karnatak-mysore

gujarat-ahemadabad, gujarat-gandhinagar

when select karntaka in 'pin_catg' class in tree view i.e 'pin_name' ,'city_n' should karnataka cities mangalore ,bangalore,mysore how add domain filter .i have xml file lot of data want written classes .domain filter

class state_catg(osv.model):      _name="state.catg"       _columns={         'state_name':fields.char('state names',size=64,required=true),     }   class city_name(osv.model):      _name="city.name"      _rec_name='city_name'     _description="define asset name"       _columns={         'city_name':fields.char('city name',size=64,required=true),         'state_name12':fields.many2one('state.catg','state',size=64,required=true),     }  class pin_catg(osv.model):      _name="pin.catg"       _columns={         'state_name':fields.many2one('state.catg','state'),         'list123':fields.one2many('pin.name','list12'),     }     class pin_name(osv.model):      _name="pin.name"       _columns={         'city_n':fields.many2one('city name',size=64,required=true),         'pin_code' : fields.char('pin code'),         'list12':fields.many2one('pin.catg','list123'),     }

in easy way take 1 master 

class res_city(models.model): _name = 'res.city'  name = fields.char('name') state_id = fields.many2one('res.country.state', 'state')   #and put onchange use state , city like:  @api.onchange('state_id') def _onchange_state_id(self):     if self.state_id:         res = {'domain': {'city_id': [('state_id', '=', self.state_id.id)]}}

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