_constraints，无法创建退款发票Odoo v10社区

Question

我有这样的限制：

_constraints = [
    (_unique_invoice_per_partner,
     _('The Document you have been entering for this Partner has already'
       ' been recorded'),
     ['Control Number (nro_ctrl)', 'Reference (reference)']),
]

是关于这个领域的：

nro_ctrl = fields.Char(
    string='Control Number', size=32, readonly=True, required=True,
    states={'draft': [('readonly', False)]},
    help="Number used to manage pre-printed invoices, by law you will"
         " need to put here this number to be able to declarate on"
         " Fiscal reports correctly.")

如果我创建一个发票，验证它，并支付它(这个字段在account.invoice模型上)，这个约束是有效的。

但是，如果我创建退款，那么它会说字段设置得不正确：

The operation cannot be completed, probably due to the following:
- deletion: you may be trying to delete a record while other records still reference it
- creation/update: a mandatory field is not correctly set

[object with reference: nro_ctrl - nro.ctrl] 

我也有这种方法，理论上应该允许“复制”或复制发票，其中包括：

@api.multi
def copy(self, default=None):
    """ Allows you to duplicate a record,
    child_ids, nro_ctrl and reference fields are
    cleaned, because they must be unique
    """
    # NOTE: Use argument name ids instead of id for fix the pylint error
    # W0621 Redefining buil-in 'id'
    #if default is None:
        #default = {}
    default = self._context.copy() #default.copy()
    default.update({
        'nro_ctrl': None, 
        'supplier_invoice_number': None,
        'sin_cred': False,
        # No cleaned in this copy because it is related to the previous
        # document, if previous document says so this too
        'date_document': False,
        'invoice_printer': '',
        'fiscal_printer': '',
        # No cleaned in this copy because it is related to the previous
        # document, if previous document says so this too
        # loc_req':False,
        'z_report': '',
    })
    return super(AccountInvoice, self).copy(default)

这是我从v8到v10社区进行的迁移。

我不知道这个copy方法是否有必要。

如何在考虑这个约束的情况下创建退款？我是说，带着nro_ctrl场。

有什么想法吗？

Answer 1

您已经创建了新的字段nro_ctrl，并且在py文件中编写了required=True。

当您在py文件中编写必需字段时，数据库表中需要的是。

在复制方法中，您正在更新'nro_ctrl'：None。由于这个原因，您在创建过程中会出现错误，因为在所需字段中不允许任何值。

如果发票中需要nro_ctrl字段，则必须在副本退款方法中给出唯一的值。