Python 使产品名称具有唯一性

我有个问题 当我试图覆盖product.product以使其名称唯一时 我补充说

import logging
from openerp.osv import fields, osv
import time
import openerp.addons.decimal_precision as dp
from openerp.tools import DEFAULT_SERVER_DATE_FORMAT
from openerp.tools.translate import _
from openerp import netsvc
from datetime import datetime, date

    class product_override(osv.osv):
        _name = 'product.product'
        _inherit = 'product.product'
        _columns = {

                    'min_charge' : fields.float(_('Min.Charge')),
                    }

        _sql_constraints = [ ('name_uniq_1', 'unique(name)', _('Name for Product must be unique!')), ]

但它不起作用。有什么帮助吗？我遗漏了什么吗？

product.product是通过委托从product.template继承的。名称字段出现在product.template中，而不是product.product中

如果你看一下日志，你会发现 openerp.sql\u db:编程错误：在查询ALTER TABLE product\u product ADD CONSTRAINT product\u product\u name\u uniq\u 1 uniquename中，键中命名的列名不存在

将代码更改为

import logging
from openerp.osv import fields, osv
import time
import openerp.addons.decimal_precision as dp
from openerp.tools import DEFAULT_SERVER_DATE_FORMAT
from openerp.tools.translate import _
from openerp import netsvc
from datetime import datetime, date

class product_template_override(osv.osv):
    _name = 'product.template'
    _inherit = 'product.template'
    _sql_constraints = [ ('name_uniq_1', 'unique(name)', _('Name for Product must be unique!')) ]

class product_override(osv.osv):
        _name = 'product.product'
        _inherit = 'product.product'
        _columns = {

                    'min_charge' : fields.float(_('Min.Charge')),
                    }