On Sat, Apr 25, 2009 at 6:26 PM, Tim Valenta <tonightslasts...@gmail.com>wrote:
>
> Hello all. I tried the IRC, but it's too chaotic and not enough
> people take you seriously :)
>
> Very very abbreviated example code:
>
> class Person(models.Model):
> parents = models.ManyToManyField('self', related_name='children')
>
> Now, the exact relationship is just an example, but it demonstrates my
> problem.
>
> Two things happen which don't seem to be normal. By "normal", I mean
> m2m relationships that relate to other models, and not "self".
>
> 1) using the admin site, I make Persons A and B. A will be a parent,
> and B will be a child. So, I use the admin site to change B,
> selecting A as a parent. But now when I go to A's change form, it
> lists B in its selected 'parents' widget. That's completely contrary
> to my previous experience with the m2m relationship. Shouldn't A only
> list B when I access "children.all()" from A?
>
> 2) But then that leads me to the second oddity. From the shell:
> >>> personA = Person.objects.get(pk=1)
> >>> personA.children.all()
> AttributeError: 'Person' object has no attribute 'children'
>
> I've been practically cursing my laptop as I've been battling this
> issue. None of my other manytomany relationships (where models relate
> to *other* models, not to "self") on my site suffer from this problem.
>
> Any direction at all would be immensely appreciated.
>
> I'm using the latest django SVN update, Python 2.5.4, MySQL.
>
> Thanks,
> Tim
> >
>
The issue is by default m2m relationships are symmetrical, you can change
this though:
http://docs.djangoproject.com/en/dev/ref/models/fields/#django.db.models.ManyToManyField.symmetrical
Alex
--
"I disapprove of what you say, but I will defend to the death your right to
say it." --Voltaire
"The people's good is the highest law."--Cicero
--~--~---------~--~----~------------~-------~--~----~
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
-~----------~----~----~----~------~----~------~--~---
