How do I use permission_classes in a custom method of a Viewset in Django?

Using Django Forms & APIs
1

Suppose that I have a Viewset named UserViewset, and I have assigned IsAuthenticated permission to UserViewset Viewset. Now, I want to create a normal method (not an action method), and I want to assign another permission to that method which is IsAdminUser, how would I do that?

Below is the code:

from rest_framework.viewsets import GenericViewSet
from rest_framework.permissions import IsAuthenticated, IsAdminUser

class UserViewset(GenericViewSet):
    permission_classes = (IsAuthenticated,) # THIS IS THE DEFAULT PERMISSION I HAVE SET FOR THIS VIEWSET WHICH WILL APPLY TO ALL METHODS OR ACTION METHODS
    
    def create(self, *args, **kwargs): # THIS IS MY CUSTOM METHOD
        permission_classes = (IsAuthenticated, IsAdminUser) # I WANT SOMETHONG LIKE THIS, BUT IT DOES NOT WORK
        .
        .
        .
2

You can Override Get-permission class

 def get_permissions(self):
    # check the action and return the permission class accordingly
    if self.action == 'create':
        return [IsAdminUser(),]
    return [IsAuthenticated(), ]

It will work only for action method. You can see that create() is normal method in my viewset. It does not have @action decoder.

3

@Bridgstoneic that is the issue, I want to use custom permission in ViewSet for a normal method, not an action method.