Hello,
I would like to detect changes in a ManyToMany field, to update data
in the linked Model. I've two objects :
class Category(models.Model):
.... some fields ...
class Post(models.Model):
.... some fields ...
categories = models.ManyToManyField(Category)
And I would like to detect (in the admin and when accessing the object
in python) when categories are added or removed to a Post. To update
some fields in the Category model. But I've tried with :
* django.db.models.signals.m2m_changed, but it doesn't appear to be
trigged in the admin
* by overriding Post.save(), but I get the same information before
and after the save() (I think it's because m2m are handled after
save() has finished) :
def save(self, *args, **kwargs):
print Post.objects.get(pk=self.id).categories.all()
super(Post, self).save(*args, **kwargs)
print Post.objects.get(pk=self.id).categories.all()
Any solutions to handle this case ? With a custom signal, or anything else ?
Thanks
--
Fabien Schwob
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