Q:

Can you register multiple ModelAdmins for a Model?  Alternatives? 

Say I have the Django model class:
class Foo(models. Model):
 bar = models. CharField()
 baz = models. CharField()

and the ModelAdmins:
class Foo_Admin_1(admin. ModelAdmin):
 list_display = ['id','bar']

class Foo_Admin_2(admin. ModelAdmin):
 list_display = ['id','baz']

is there any way to register both ModelAdmins so that they show up under the Django Admin interface? 
I tried:
admin.site.register(Foo,Foo_Admin_1)
admin.site.register(Foo,Foo_Admin_2)

but I get the error:
The model Foo is already registered

Any suggestions? 
If not, are there alternative ways to (dynamically) control the fields shown in the ModelAdmin change list view? 

A:

Create an empty proxy subclass and register it instead:
class Foo(models. Model):
    bar = models. CharField()
    baz = models. CharField()

# admin.py
class FooProxy(Foo):
    class Meta:
        proxy=True

admin.site.register(Foo, FooAdmin1)
admin.site.register(FooProxy, FooAdmin2) 

