OpenERP - many2one 删除旧数据答案

【问题标题】：OpenERP - many2one remove old dataOpenERP - many2one 删除旧数据
【发布时间】：2014-04-08 20:42:13
【问题描述】：

我有一个存储一些数据的 one2many。

在python中，当我需要用.write方法更新对象时；新数据被存储，但旧数据仍然存在。

如何在使用 .write 方法之前清空 many2many ？？

也许使用 .browse 和 .search ??请帮忙！！！

【问题讨论】：

标签： field openerp

【解决方案1】：

如果您发布了一些您正在尝试做的事情的示例，那就太好了。无论如何，您有 2 个解决方案：

使用unlink()
了解write() ORM 方法如何作用于one2many 字段。

以account.invoice和account.invoice.line为例。

第一种方法——unlink():

def delete_lines(self, cr, uid, ids, context=None):
    invoice_pool = self.pool.get('account.invoice')
    line_pool = self.pool.get('account.invoice.line')
    for invoice in invoice_pool.browse(cr, uid, ids, context=context):
        line_ids = [line.id for line in invoice.invoice_line]
        line_pool.unlink(cr, uid, line_ids, context=context)

第二种方法——write()

查看 OpenERP 文档 (https://doc.openerp.com/6.0/developer/2_5_Objects_Fields_Methods/methods/#osv.osv.osv.write)：

write(cr, user, ids, vals, context=None)
...
Note: The type of field values to pass in vals for relationship fields is specific:

For a one2many field, a lits of tuples is expected. Here is the list of tuple that are accepted, with the corresponding semantics
(2, ID)                remove and delete the linked record with id = ID (calls unlink on ID, that will delete the object completely, and the link to it as well)

所以对于vals 参数，我们需要以下格式的元组列表：

[
    (2, line1_id),
    (2, line2_id),
    (2, line3_id),
    ...
]

以下代码说明了write() 方法的使用。

def delete_lines(self, cr, uid, ids, context=None):
    invoice_pool = self.pool.get('account.invoice')
    for invoice in invoice_pool.browse(cr, uid, ids, context=context):
        vals = [(2, line.id) for line in invoice.invoice_line]
        invoice.write(vals)

我没有测试这些示例，所以请告诉我他们是否可以完成这项工作。

【讨论】：

感谢您的回答；我发布了我是如何解决它的，这几乎是你的第二个选择。

【解决方案2】：

我是这样解决的：

my_object = self.pool.get('my.main.object')
props = self.pool.get('table.related')
prop_id = props.search(cr, uid, [('id_1', '=', id_2)])
del_a = []
for p_id in prop_id:
   del_a.append([2, p_id])
my_object.write(cr, uid, line_id, {'many2one_field': del_a}, context=context)

在哪里： del_a.append([2, p_id]) 创建代码为“2”的元组字符串（删除） my_object 是我需要进行更改的地方。

【讨论】：