Re: how to properly use the m2m_changed signal?

Changing the m2m_changed signal on Project.departments.through to post_save on ProjectDepartmentMembership did the trick.

m2m_changed signal seems to work as long as you don't explicitly define the "through" model.



On 06/28/2013 02:06 PM, Roberto López López wrote:

I am doing tests and the m2m_changed signal seems to work perfectly as long as I have not defined a "through" model. Is there any trick here?

Thanks!




On 06/28/2013 12:14 PM, Roberto López López wrote:

I have tried as well using the post_save signal and overriding the save() method. But in none of those cases Project.departments is populated yet when reaching my code :-/



On 06/28/2013 11:50 AM, Roberto López López wrote:

Hi,

I am trying to listen to the m2m_changed signal on my models, but I can't make it work. Even the execution flow does not reach the linked method!

class Project(models.Model):
    departments = models.ManyToManyField('department.Department', related_name='projects',
                                         through='project.ProjectDepartmentMembership')

@receiver(m2m_changed, sender=Project.departments.through)
def _on_change_m2m(sender, instance, action, reverse, model, pk_set, using, **kwargs):
    pass

As interface I am using the django admin, and departments appears as an inline of Project

Any help please? Thanks.

Cheers,

Roberto


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--   Kind regards,    Roberto López López      System Developer  Parallab, Uni Computing  Høyteknologisenteret, Thormøhlensgate 55  N-5008 Bergen, Norway  Tel:        (+47) 555 84091

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--   Kind regards,    Roberto López López      System Developer  Parallab, Uni Computing  Høyteknologisenteret, Thormøhlensgate 55  N-5008 Bergen, Norway  Tel:        (+47) 555 84091

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--   Kind regards,    Roberto López López      System Developer  Parallab, Uni Computing  Høyteknologisenteret, Thormøhlensgate 55  N-5008 Bergen, Norway  Tel:        (+47) 555 84091