text: from django.contrib.auth.models import User, Group
  from rest_framework import serializers
  
  
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ['url', 'username', 'email', 'groups', 'is_staff']
  
  
  class GroupSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Group
          fields = ['url', 'name']