ManyToManyField with relation to self not saved in admin when using inheritance

[Mathijs de Bruin]

In the following example code, the 'links' field does not get saved in the admin for ChildModel:

class ParentModel(models.Model):
    slug = models.SlugField()

    # For some reason, changes do not get saved (anymore)
    links = models.ManyToManyField('self', related_name='links', null=True, blank=True)
                    
    def __unicode__(self):
        return self.slug
        
class ChildModel(ParentModel):
    text = models.TextField()

The admin is registred simply by using:
admin.site.register(ChildModel)

It seems to me this is a bug in either the newforms Admin or newforms.

[sebastian.hillig]

A specific ChildModel seems only to save itself as a link, refuses to save every other child.

[sebastian.hillig]

Fat fingers i guess. Only wanted to accept that one.

[James Bennett]

Lack of activity/patch here, and the fact that it's a relatively uncommon case suggests this probably can be handled post-1.0.

[(none)]

Milestone post-1.0 deleted

[madhusudancs@…]

With the same code piece I just inserted test1 test2 test3 as slug field values for ParentModel and testc1 testc2 and testc3 for ChildModel and linked testc2 to testc1 and testc3 to testc2

The bug is not just in the admin, it happens on the interactive interpreter too. This is the small piece of test code on the interpreter.

from dummy.testapp.models import ChildModel, ParentModel
ChildModel.objects.all()

[<ChildModel: testc1>, <ChildModel: testc2>, <ChildModel: testc3>]

ParentModel.objects.all()

[<ParentModel: test1>, <ParentModel: tes2>, <ParentModel: test3>, <ParentModel: testc1>, <ParentModel: testc2>, <ParentModel: testc3>]

c2 = ChildModel.objects.get(slug='testc2')
c2.links

<django.db.models.fields.related.ManyRelatedManager object at 0x99c490c>

c2.links.all()

[]

c1 = ChildModel.objects.get(slug='testc1')
c1.links.all()

[<ParentModel: testc2>, <ParentModel: testc3>]

c3 = ChildModel.objects.get(slug='testc3')
c3.links.all()

[]

So I suppose this bug is not just in admin Interface but in the ORM itself. So I change the component. Can some one help me track this bug and fix it? As in how to go about? Where to look for the code?

[Jonas Obrist]

can't reproduce, ran both admin and the python code.