Model Inheritance doesn't work in the admin.

[anonymous]

Under QS-RF, inherited models don't work in the admin. See Malcolm's message: ​http://groups.google.com/group/django-developers/msg/c0fb00dabb70c660

[Jacob]

We're going to need a lot more information to be able to debug this one. Please read our ​guidelines for submitting bugs, and especially this:

Do write complete, reproducible, specific bug reports. Include as much information as you possibly can, complete with code snippets, test cases, etc. This means including a clear, concise description of the problem, and a clear set of instructions for replicating the problem. A minimal example that illustrates the bug in a nice small test case is the best possible bug report.

Feel free to reopen with more info if you've got it.

[anonymous]

Sorry, I hope that this comment helps you to reproduce the behaviour that I think that is a bug.

Reproducing de bug

1. Suppose a django app with this model:

   class Place(models.Model):
       name = models.CharField(max_length=50)
       address = models.CharField(max_length=80)
   
       def __unicode__(self):
           return u"%s the place" % self.name
   
       class Admin:
           pass
   
   class Restaurant(Place):
       serves_hot_dogs = models.BooleanField()
       serves_pizza = models.BooleanField()
   
       def __unicode__(self):
           return u"%s the restaurant" % self.name
   
       class Admin:
           pass
   

2. Now, go to the admin site (<address to your app>/admin) and create a new Restaurant.
3. Then, try edit the restaurant created in the previous step. Modify some field value and press "save". Now when go to the Restaurant list appears TWO restaurants: the save on tha previous step creates a new restaurant instead of edit the first.

NOTE

If define the primary key of the parent class(Place) explicitly the edition functionality works well:

class Place(models.Model):
    id = models.AutoField('id', primary_key=True, editable=False)
    name = models.CharField(max_length=50)
    address = models.CharField(max_length=80)

    def __unicode__(self):
        return u"%s the place" % self.name

    class Admin:
        pass

class Restaurant(Place):
    serves_hot_dogs = models.BooleanField()
    serves_pizza = models.BooleanField()

    def __unicode__(self):
        return u"%s the restaurant" % self.name

    class Admin:
        pass

[Karen Tracey <kmtracey@…>]

I believe this is a known problem. You are using queryset-refactor, model inheritance, and admin. Per Malcolm's note yesterday on the status of queryset-refactor:

​http://groups.google.com/group/django-developers/msg/c0fb00dabb70c660

"model inheritance is not expected to work in admin at the moment".

[Jacob]

As Karen said, MI doesn't yet work in the admin; updating the ticket to indicate that.

IMO, also, we could simply wait for newforms-admin to fix this; dunno how much that'll annoy people.