old_contents: from rest_framework import serializers
  from django.contrib.auth.models import User, Group
  
  from lupsEdgeServer.models import *
  
  # Serializers define the API representation.
  class GroupSerializer(serializers.ModelSerializer):
      class Meta:
          model = Group
          fields = '__all__'
  
  class UserSerializer(serializers.ModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email', 'is_staff', 'groups')
  
  class ManufactureSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Manufacturer
          fields = '__all__'
  
  class GatewaySerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Gateway
          fields = '__all__'
  
  class ActuatorSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Actuator
          fields = '__all__'
  
  class BaseParameterSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = BaseParameter
          fields = '__all__'
  
  class ContextServerSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = ContextServer
          fields = '__all__'
  
  class SensorTypeSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = SensorType
          fields = '__all__'
  
  class SensorSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Sensor
          fields = '__all__'
  
  class PersistanceSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Persistance
          fields = '__all__'
  
  class RuleSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Rule
          fields = '__all__'
  
  class ScheduleSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Schedule
          fields = '__all__'
  
  
new_contents: from rest_framework import serializers
  from django.contrib.auth.models import User, Group
  
  from lupsEdgeServer.models import *
  
  # Serializers define the API representation.
  class GroupSerializer(serializers.ModelSerializer):
      class Meta:
          model = Group
          fields = '__all__'
  
  class UserSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = User
          fields = ('url', 'username', 'email', 'is_staff', 'groups')
  
  class ManufactureSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Manufacturer
          fields = '__all__'
  
  class GatewaySerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Gateway
          fields = '__all__'
  
  class ActuatorSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Actuator
          fields = '__all__'
  
  class BaseParameterSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = BaseParameter
          fields = '__all__'
  
  class ContextServerSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = ContextServer
          fields = '__all__'
  
  class SensorTypeSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = SensorType
          fields = '__all__'
  
  class SensorSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Sensor
          fields = '__all__'
  
  class PersistanceSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Persistance
          fields = '__all__'
  
  class RuleSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Rule
          fields = '__all__'
  
  class ScheduleSerializer(serializers.HyperlinkedModelSerializer):
      class Meta:
          model = Schedule
          fields = '__all__'
  
  
subject: Change User Serializer to hyperlinked serializer