Django 信号 m2m_changed 未触发

发布于 2024-11-17 05:28:38 字数 855 浏览 7 评论 0原文

我最近开始在我的 Django 项目（v.1.3）中使用信号，它们都工作正常，除了我只是不明白为什么 m2m_changed 信号永远不会在我的模型上触发。通过在 django 管理表单上添加/删除 PageChild 内联实例来编辑部分实例。

我尝试按照文档中所述的任一方式注册回调函数，但没有得到任何结果。

摘自我的 models.py

from django.db import models
from django.db.models.signals import m2m_changed


class Section(models.Model):
    name = models.CharField(unique = True, max_length = 100)
    pages = models.ManyToManyField(Page, through = 'PageChild')

class PageChild(models.Model):
    section = models.ForeignKey(Section)
    page = models.ForeignKey(Page, limit_choices_to = Q(is_template = False, is_background = False))


@receiver(m2m_changed, sender = Section.pages.through)
def m2m(sender, **kwargs):
    print "m2m changed!"

m2m_changed.connect(m2m, sender = Section.pages.through, dispatch_uid = 'foo', weak = False)

我是否遗漏了一些明显的东西？

原文

I recently started to use signals in my Django project (v. 1.3) and they all work fine except that
I just can't figure out why the m2m_changed signal never gets triggered on my model. The Section instance is edited by adding/deleting PageChild inline instances on an django admin form.

I tried to register the callback function either way as described in the documentation, but don't get any result.

Excerpt from my models.py

from django.db import models
from django.db.models.signals import m2m_changed


class Section(models.Model):
    name = models.CharField(unique = True, max_length = 100)
    pages = models.ManyToManyField(Page, through = 'PageChild')

class PageChild(models.Model):
    section = models.ForeignKey(Section)
    page = models.ForeignKey(Page, limit_choices_to = Q(is_template = False, is_background = False))


@receiver(m2m_changed, sender = Section.pages.through)
def m2m(sender, **kwargs):
    print "m2m changed!"

m2m_changed.connect(m2m, sender = Section.pages.through, dispatch_uid = 'foo', weak = False)

Am I missing something obvious?

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玻璃人 2024-11-24 05:28:38

这是一个未解决的错误： https://code.djangoproject.com/ticket/16073

我浪费了这周的时间。

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早茶月光 2024-11-24 05:28:38

您将连接它两次，一次使用 m2m_changed.connect ，另一次使用接收器装饰器。

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柒夜笙歌凉 2024-11-24 05:28:38

不确定它是否有帮助，但以下内容对我有用：

class Flow(models.Model):
    datalist = models.ManyToManyField(Data)

from django.db.models.signals import post_save, pre_delete, m2m_changed

def handle_flow(sender, instance, *args, **kwargs):
    logger.debug("Signal catched !")

m2m_changed.connect(handle_flow, sender=Flow.datalist.through)

Not sure if it will help, but the following is working for me:

class Flow(models.Model):
    datalist = models.ManyToManyField(Data)

from django.db.models.signals import post_save, pre_delete, m2m_changed

def handle_flow(sender, instance, *args, **kwargs):
    logger.debug("Signal catched !")

m2m_changed.connect(handle_flow, sender=Flow.datalist.through)

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