django m2m_changed信号与定制通过模型 [英] django m2m_changed signal with custom through model
问题描述
我正在尝试使用 m2m_changed
信号在我的应用程序
中触发一些操作。然而, signaltest()
的打印输出表示我仅在 pre_clear
和 post_clear
动作。我的 models.py
如下所示:
I am trying to use the m2m_changed
signal to trigger some actions in my application
. However, the printout of signaltest()
indicates that I am only signalled on pre_clear
and post_clear
actions. My models.py
looks like this:
class Entry(models.Model):
objects = managers.MyEntryManager()
...
fields = models.ManyToManyField('Field', through='EntryField')
class Field(models.Model):
name = models.CharField(max_length=64, unique=True)
description = models.CharField(max_length=256, blank=True)
class EntryField(models.Model):
entry = models.ForeignKey('Entry')
field = models.ForeignKey('Field')
value = models.CharField(max_length=256)
def signaltest(**kwargs):
print kwargs['action']
signals.m2m_changed.connect(signaltest, sender=Entry.fields.through, weak=False, dispatch_uid='signaltest')
EntryField
对象在代码中的其他地方使用以下代码创建:
The EntryField
objects are created elsewhere in the code using the following code:
some_entry.fields.clear()
models.EntryField.objects.get_or_create(
entry=some_entry,
field=some_field,
defaults = { 'value': field_value }
)
第一个电话负责 pre_clear
和 post_clear
我收到的事件但是,第二次调用不产生任何信号。
The first call is responsible for the pre_clear
and post_clear
events I receive. However, the second call generates no signals.
在我看来, django bug#13757 与这个(mis)行为有关,但我可能会缺少某些东西。
It seems to me that django bug #13757 is related to this (mis)behaviour, but I may be missing something.
有没有办法重新连线信号(可能使用 m2m_changed
之外的一些信号)有 post_save
信号,当 EntryField
创建?
Is there a way to "rewire" the signals (perhaps using some signal other than m2m_changed
) to have post_save
signals generated when a EntryField
is created?
推荐答案
你能试试这个吗?
def signaltest(**kwargs):
print kwargs['instance']
print kwargs['created']
signals.post_save.connect(signaltest, sender=EntryField, weak=False, dispatch_uid='signaltest')
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