Question

我有 one2many ，可存储一些数据。

在 python 中，当我需要使用 .write 方法更新对象时;存储了新数据，但旧的东西仍在那里。

如何在使用 .write 方法之前清空 many2many ？

也许使用 .browse 和 .search ？请帮忙!!!

Answer 1

如果您发布了一些您想要做的事情的例子，那就太棒了。无论如何，你有2个解决方案：

使用unlink()
了解write() ORM方法如何在one2many字段上运行。

我们以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)

因此，对于vals参数，我们需要以下列格式的元组列表：

[
    (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)

我没有测试这些例子，所以让我知道他们是否做了这个工作。

Answer 2

以下是我解决它的方法：

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)

其中： del_a.append（[2，p_id]）使用代码＆＃34; 2＆＃34;创建元组字符串。（删除） my_object 是我需要进行更改的地方。

OpenERP - many2one删除旧数据

2 个答案: