Custom User return empty get_all_permissions() - django

Question

I'm just trying start work with Permissions to learn how thats work.
In shell i have empty set() result from user_test.get_all_permissions(). I see this question, is the same of that, but i can't find what is missing im my code:
Edit
Now seeing in class ModelBackend, a particular part confuses my mind: ...get_all_permissions(),...allow an object to be passed as a parameter for object-specific permissions, but this backend does not implement them other than returning an empty set of permissions if obj is not None
And bellow in docs:
get_all_permissions(user_obj, obj=None)
Returns the set of permission strings the user_obj has, including both user permissions and group permissions. Returns an empty set if is_anonymous or is_active is False.
My user have is_active flag=true, even though user_test.get_all_permissions() return empty set().
In this question a comment call my atention:
"You need to implement a get_all_permissions in your User model..."
I'm lost in this general understanding that part of Permissions concept.
I created Custom User from AbstractBaseUser, with follow code:
settings.py
...
INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'users',
]
AUTH_USER_MODEL = 'users.User'
AUTHENTICATION_BACKENDS = [
'users.backends.CustomModelBackend',
]
...
models.py
class UserManager(BaseUserManager):
def create_user(self, email, username, phone, password = None):
...
def create_superuser(self, email, username, phone, password = None):
...
class User(AbstractBaseUser, PermissionsMixin):
...
objects = UserManager()
...
def __str__(self):
return self.email
def has_perm(self, perm, obj=None):
return True
def has_module_perms(self, app_label):
return True
backends.py
class CustomModelBackend(backends.ModelBackend):
def user_can_authenticate(self, user):
return True
In shell i try something like:
>>> from users.models import User
>>> user_test = User.objects.get(email="user#example.com")
>>> user_test.get_all_permissions()
set()
That user is superuser. And i test it to regular user to
EDIT
I realized that I might need to implement this in the backend, I don't know if it's the correct path, but making the following change I get the following error:
backends.py edit
from django.contrib.auth import backends
def _user_get_permissions(user, obj, from_name):
permissions = set()
name = 'get_%s_permissions' % from_name
for backend in backends.get_backends():
if hasattr(backend, name):
permissions.update(getattr(backend, name)(user, obj))
return permissions
class CustomModelBackend(backends.ModelBackend):
def user_can_authenticate(self, user):
return True
def _get_user_permissions(self, user_obj):
return user_obj.user_permissions.all()
def get_all_permissions(self, obj=None):
return _user_get_permissions(self, obj, 'all')
The error:
...
line 198, in _user_get_permissions
permissions.update(getattr(backend, name)(user, obj))
TypeError: get_all_permissions() takes from 1 to 2 positional arguments but 3 were given
What is needed to check that permissions?

Answer 1

For superuser this list would be empty. On has_perm method there is IF for superuser and its always return True for superuser

Answer 2

In my case, I had my custom User class, and I was trying to use djago-jazzmin for admin panel. I was getting error because I didn't have get_all_permissions method on my custom User model. Implementing stated method as below solved my problem and I was able to successfully load jazzmin admin:
def get_all_permissions(user=None):
if user.is_superadmin:
return set()