old_contents: from django_handleref.models import HandleRefModel
  from rest_framework import serializers
  
  class HandleRefSerializer(serializers.ModelSerializer):
    version = serializers.ReadOnlyField()
    class Meta:
      model = HandleRefModel,
      fields = [
        'created',
        'updated',
        'status',
        'version',
      ]
  
new_contents: from django_handleref.models import HandleRefModel
  from rest_framework import serializers
  
  class HandleRefSerializer(serializers.ModelSerializer):
    version = serializers.ReadOnlyField()
    class Meta:
      model = HandleRefModel,
      fields = [
        'created',
        'updated',
        'status'
      ]
  
subject: drop version field from handleref serializer