Hi,
I am having trouble registering a function to the m2m_changed signal. My
code is as follows:
1. from django.db.models.signals import m2m_changed
2. from django.db import models
3. from django.dispatch.dispatcher import receiver
4.
5. class Project(models.Model):
6. employees = models.ManyToManyField('staff.Person',
through='project.PersonProjectMembership',
7. related_name='projects')
8.
9. class PersonProjectMembership(models.Model):
10. project = models.ForeignKey('project.Project',
related_name="person_memberships")
11. person = models.ForeignKey('staff.Person',
related_name="project_memberships")
12. lead = models.BooleanField(default=False)
13. position = models.CharField(max_length=50)
14. project_manager = models.BooleanField(
15. default=False
16. )
17.
18. class Meta:
19. permissions = (
20. ('view_personprojectmembership', _('View person project membership')),
21. )
22.
23. @receiver(m2m_changed, sender=Project.employees.through)
24. def _on_save_project_assign_privileges(sender, instance, action,
reverse, model, pk_set, using, **kwargs):
25. # [...]
Somehow it doesn't seem to work, the execution point never reaches the
_on_save_project_assign_privileges function when I modify the m2m
relation (I am using the admin interface for that). On the other side, I
have another method registered to the post_save signal for the same
object and it works correctly.
I have read the signals documentation -concretely the m2m_changed-,
re-read my code, googled for it, asked in other sites... but I have not
been able to find a solution. Any help please? Thanks!
Roberto
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