How to create a custom admin panel for many models

I want to create a custom ModelAdmin, but for a mix of models, not just one.

I have two example models:

class Article(models.Model):      author = models.GenericIPAddressField()      # ...    class Comment(models.Model):      author = models.GenericIPAddressField()      # ...

Now I want to be able to have a ModelAdmin with fields:

author  number_of_comments  number_of_articles

How can I achieve it?

I created a new ModelAdmin with overridden queryset method, but I was not able to register it, because Article and Comment are already registered.

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