vi du nhu class tacgia,class sach voi sach co ten tacgia(chi lay ten tac gia) thi lam sao ?

class Tacgia(models.Model):
    _name = 'tacgia'
    ten_tg = fields.Char(string='Ten Tac gia')
    Nam_sinh = fields.Date(
        string='Nam Sinh'
    )
    diachitg = fields.Char(
        string='dia chi Tac Gia'
    )
class Sach(models.Model):
    _name = 'sach'
    def name_get(self,cr,uid,ids,context=None):
    	res=[]
    	for id in ids:
    		elmt=self.browse(cr,uid,id,context=context)
    		res.append((id,self._get_one_full_name(elmt)))
    	return res
    ten_sach = fields.Char(string='Ten Sach')
    tentacgia_id = fields.Many2one(
        'tacgia',
        string='Ten Tac Gia',
        selection=name_get
    )
    ten_nxb = fields.Char(string='Ten Nbx')