It seems that with Django 1.5, the UUIDField doesn't work well when used as a primary key with multi-table inheritance.

My models:

from django.db import models
from django_extensions.db.fields import UUIDField


class ParentModel(models.Model):

    uid = UUIDField(max_length=64, primary_key=True, editable=False,
                    blank=True, version=4)

    parent_field = models.CharField(max_length=64)


class ChildModel(ParentModel):
    child_field = models.CharField(max_length=64)

Then I create a child object:

>>> from myapp.models import ChildModel
>>> obj = ChildModel.objects.create(parent_field="I'm in the parent table", child_field="I'm in the child table")
>>> obj.pk
1

As you can see the pk attribute is not correct. When I look in database, I can see that the link to the parent table is incorrect:

sqlite> .header on
sqlite> .mode column
sqlite> select * from myapp_childmodel;
parentmodel_ptr_id  child_field           
------------------  ----------------------
1                   I'm in the child table
sqlite> select * from myapp_parentmodel;
uid                                   parent_field           
------------------------------------  -----------------------
285fbd0a-faf9-463e-9d8e-d6d67f533e4d  I'm in the parent table

After investigating the issue I found that the correct value was set at some point but was then overridden by Django here: https://github.com/django/django/blob/1aca9d93beaac9f5e37cd90d1e29e572b5f7a86d/django/db/models/base.py#L664

The critical bit is:

            if update_pk:
                setattr(self, meta.pk.attname, result)

The value of update_pk depends on the value of meta.has_auto_field that is set to True by UUIDField's contribute_to_class method.

So this patch fixes the issue for me:

diff --git a/django_extensions/db/fields/__init__.py b/django_extensions/db/fields/__init__.py
index a3b1d68..94c2f9a 100644
--- a/django_extensions/db/fields/__init__.py
+++ b/django_extensions/db/fields/__init__.py
@@ -250,7 +250,7 @@ class UUIDField(CharField):
                 self, cls, name, cls._meta.auto_field
             )
             super(UUIDField, self).contribute_to_class(cls, name)
-            cls._meta.has_auto_field = True
+            cls._meta.has_auto_field = False
             cls._meta.auto_field = self
         else:
             super(UUIDField, self).contribute_to_class(cls, name)

I'm not sure of all the consequences of doing this, but it doesn't seem completely crazy to set has_auto_field to False since UUIDField is not an AutoField.