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Feature Description

Small refactor: extract a -> method to allow to extend/change the permissions for a user.

Problem

I'd like to implement some hierarchy for the permissions which requires some post-work with the explicitly set permissions. Now I have to rewrite the whole _get_permissions method in a subclass, while I just need the explicitly set permissions to know what other permissions I should add there.

Request or proposal

proposal

Additional Details

No response

Implementation Suggestions

At this code: https://github.com/django/django/blob/23529b662793cdf4725d5f8ff58f0df94b343365/django/contrib/auth/backends.py#L119

Instead of this:

...

perms = perms.values_list("content_type__app_label", "codename").order_by()
setattr(
	user_obj, perm_cache_name, {"%s.%s" % (ct, name) for ct, name in perms}
)

...

Extract the conversion to a new method:

def _permission_strings(self, permission_queryset):
	perms = permission_queryset.values_list("content_type__app_label", "codename").order_by()
	return {f"{ct}.{name}" for ct, name in perms}

...

setattr(
	user_obj, perm_cache_name, self._permission_strings(perms)
)

...