Why can't I register multiple Django ModelAdmin with same Model?

django, django-admin, django-models, python

Solution

Use proxy models:

class Event(db.Model):
     ...

class ActiveEventManager(models.Manager):
    def get_queryset(self):
        return super(ActiveEventManager, self).get_queryset().filter(active=True)

class ActiveEvent(Event):
    class Meta:
        proxy = True

    objects = ActiveEventManager()

class ArchiveEventManager(models.Manager):
    def get_queryset(self):
        return super(ArchiveEventManager, self).get_queryset().filter(active=False)


class ArchiveEvent(Event):
    class Meta:
        proxy = True

    objects = ArchiveEventManager()

Now, you can register 2 models without override `ModelAdmin.queryset` method:

class EventAdmin(admin.ModelAdmin):
    # ModelAdmin config

admin.site.register(ActiveEvent, EventAdmin)
admin.site.register(ArchiveEvent, EventAdmin)

You can read mode about proxy models and managers in the doc.

Also, use this:

queryset = super(EventArchiveAdmin, self).queryset(request)

As first argument `super()` take current class. See doc

Note: django has renamed `Manager.get_query_set` to `Manager.get_queryset` in django==1.7.

Problem

I have the following ModelAdmin: ``` class EventAdmin(admin.ModelAdmin): # ModelAdmin config def queryset(self, request): queryset = super(EventAdmin, self).queryset(request) return queryset.exclude(date_end__lt=date.today()) admin.site.register(Event, EventAdmin) ``` Now I want to add a model to manage archived (older than today) events. ``` class EventArchiveAdmin(admin.ModelAdmin): # ModelAdmin config def queryset(self, request): queryset = super(EventArchiveAdmin, self).queryset(request) return queryset.filter(date_end__lt=date.today()) admin.site.register(Event, EventArchiveAdmin) ``` But if I try to do so I get AlreadyRegistered exception. Why can't I implement another ModelAdmin with same Model and how can I get different admin views of the same model? I know I can implement a custom `list_filter` in my class but I'd like to keep things separated in different pages.

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