Hi,
I need to use the m2m_changed signal to assign permissions over an
object. But somehow, I cannot make it work.
To summarise, my models.py is as follows:
from cmsplugin_news.models import News
from django.contrib.auth.models import Group
from django.db import models
from guardian.shortcuts import assign_perm, remove_perm
class Department(models.Model):
news = models.ManyToManyField(
News, blank=True, related_name='departments'
)
write_group = models.ForeignKey(Group, blank=True)
@receiver(m2m_changed, sender=Department.news.through)
def _m2m_changed_news_departments(sender, instance, action, reverse,
model, pk_set, **kwargs):
if action == "pre_add":
for pk in pk_set:
d = Department.objects.get(pk__exact=pk)
assign_perm('cmsplugin_news.change_news', d.write_group,
instance)
assign_perm('cmsplugin_news.delete_news', d.write_group,
instance)
elif action == "pre_remove":
for pk in pk_set:
d = Department.objects.get(pk__exact=pk)
remove_perm('cmsplugin_news.change_news', d.write_group,
instance)
remove_perm('cmsplugin_news.delete_news', d.write_group,
instance)
The point is that the signal is never caught. I am editing the m2m
relation from the admin interface (as an inline in cmsplugin_news). When
I add/delete a department from the formset, the signal is never caught
by my method.
Any help here? Thank you very much.
Roberto
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