python - 属性错误: 'NoneType' object has no attribute '_columns'

Question

我正在 OpenERP 中编写一个从 Accounts 模块继承的模块。下面是我的简化代码

from osv import fields, osv
import decimal_precision as dp

class account_molly(osv.osv):

    def __computeOB(self, cr, uid, ids, context=None):
        res = []
        return 0

    def __computeCB(self, cr, uid, ids, context=None):
        res = []
        return 0

    _name = "account.molly"
    _description = "This is Molly Special Account View"
    _inherit = "account.account"
    _columns = {
        'opening_balance': fields.function(__computeOB, digits_compute=dp.get_precision('Account'), method=True, string='Opening Balance'),
        'end_balance': fields.function(__computeCB, digits_compute=dp.get_precision('Account'), method=True, string='End Balance'),
    }   

account_molly()

# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:

当我尝试安装该模块时，我得到

AttributeError: 'NoneType' object has no attribute '_columns'

请问可能是什么问题

Answer 1

请检查您创建的模块的依赖关系。 openerp.py文件中，依赖列表中如果没有添加“account”，请添加。如果这没有解决您的问题，请提供错误日志