I'm imagining some pretty simple that would capture the M2M relationship, like this slightly modified one from the Django docs
models: http://www.djangoproject.com/documentation/models/many_to_many/ picklefield: http://www.djangosnippets.org/snippets/513/ from django.db import models from utils.fields import PickleField class Publication(models.Model): title = models.CharField(max_length=30) def __unicode__(self): return self.title class Meta: ordering = ('title',) class Article(models.Model): headline = models.CharField(max_length=100) publications = models.ManyToManyField(Publication) publications_denorm = PickleField(null=True, editable=False) def __unicode__(self): return self.headline class Meta: ordering = ('headline',) def save(self): print "Before", self.publications.all() super(Article, self).save() print "after", self.publications.all() But my efforts to pull things like this off have been frustrated by being unable to be a signals to do the necessary filling in of the _denorm field. As described here: http://groups.google.com/group/django-users/browse_thread/thread/99680b69d2d4799c/07093d3695163269 But, to reiterate my first post, this is just one hacky concept that I've stumbled with. I suspect there might be better concepts back at the drawing board and wouldn't want to push it as a best practice. On Tue, May 19, 2009 at 10:12 AM, George Song <geo...@damacy.net> wrote: > > On 5/19/2009 9:47 AM, Ben Welsh wrote: > > On Tue, May 19, 2009 at 12:18 AM, George Song <geo...@damacy.net > > <mailto:geo...@damacy.net>> wrote: > > > > > > You can always explicitly define the m2m model, then you can override > > the save() on that model if you like, or use signals like any other > > model. > > > > > > Perhaps I've fumbled my way past the obvious, but the problem I'm > > running into with that method is the one described in the link above. It > > seems the M2M data connections are not inserted into the relational > > database until a PK has been created and all the signals have already > > fired. > > Can you be more explicit about describing what it is you want to do? > > -- > George > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
