old_contents: from core.models import Tag
  from rest_framework import serializers
  from .user_serializer import UserSerializer
  
  
  class TagSerializer(serializers.ModelSerializer):
      user = UserSerializer()
  
      class Meta:
          model = Tag
          fields = ('id', 'name', 'description', 'user')
  
new_contents: from core.models import Tag
  from rest_framework import serializers
  from .user_serializer import UserSerializer
  
  
  class TagSerializer(serializers.ModelSerializer):
      user = UserSerializer(read_only=True)
  
      class Meta:
          model = Tag
          fields = ('id', 'name', 'description', 'user')
  
subject: make tag user field read only