Unable to unregister ModelAdmin

[PetrDlouhy]

If I try to unregister ModelAdmin with RelatedFieldAdmin ancestor I got error:

  File "/home/petr/soubory/programovani/blenderkit/blenderhub_server/blenderhub/apps/history_register/admin.py", line 7, in <module>
    admin.site.unregister(PaymentAdmin)
  File "/home/petr/.cache/pypoetry/virtualenvs/blenderkit-server-eqrfB9dY-py3.10/lib/python3.10/site-packages/django/contrib/admin/sites.py", line 159, in unregister
    for model in model_or_iterable:
TypeError: 'RelatedFieldAdminMetaclass' object is not iterable

[PetrDlouhy]

The problem was, that I was unregistering ModelAdmin, not Model. It should be:

admin.site.unregister(Payment)

not

admin.site.unregister(PaymentAdmin)