Re: How to restore Models original Properties - Problem in Models column Exclude

Not an admin expert here.

You are modifying the modeladmin instance and, by the behavior you're describing, it looks like it is a global (shared) object. I'm guessing, you can confirm this by printing id(self) in add_view(). I'll bet you get the same value in each request, so the instance is shared, so the change is visible (persisted) across request boundaries.

You may think about adding self.exclude = () in the else branch in order to not exclude anything. Don't do that, you may end up leaking private information to dgp if both root and dgp are logged in at the same time.

Instead override the get_exclude method.

See https://docs.djangoproject.com/en/2.2/ref/contrib/admin/#django.contrib.admin.ModelAdmin.get_exclude

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