old_contents: """
  Serializers for all Course Entitlement related return objects.
  """
  from django.contrib.auth import get_user_model
  from rest_framework import serializers
  
  from entitlements.models import CourseEntitlement, CourseEntitlementSupportDetail
  from openedx.core.lib.api.serializers import CourseKeyField
  
  
  class CourseEntitlementSerializer(serializers.ModelSerializer):
      """ Serialize a learner's course entitlement and related information. """
      user = serializers.SlugRelatedField(slug_field='username', queryset=get_user_model().objects.all())
      enrollment_course_run = serializers.CharField(
          source='enrollment_course_run.course_id',
          read_only=True
      )
      support_details = serializers.SerializerMethodField()
  
      def get_support_details(self, model):
          """
          Returns a serialized set of all support interactions with the course entitlement
          """
          qset = CourseEntitlementSupportDetail.objects.filter(entitlement=model).order_by('-created')
          return CourseEntitlementSupportDetailSerializer(qset, many=True).data
  
      class Meta:
          model = CourseEntitlement
          fields = (
              'user',
              'uuid',
              'course_uuid',
              'enrollment_course_run',
              'expired_at',
              'created',
              'modified',
              'mode',
              'order_number',
              'support_details'
          )
  
  
  class CourseEntitlementSupportDetailSerializer(serializers.ModelSerializer):
      """ Serialize the details of a support team interaction with a learner's course entitlement. """
      support_user = serializers.SlugRelatedField(
          read_only=True,
          slug_field='username',
          default=serializers.CurrentUserDefault()
      )
      unenrolled_run = CourseKeyField('unenrolled_run.id')
  
      class Meta:
          model = CourseEntitlementSupportDetail
          fields = (
              'support_user',
              'action',
              'comments',
              'unenrolled_run'
          )
  
new_contents: """
  Serializers for all Course Entitlement related return objects.
  """
  from django.contrib.auth import get_user_model
  from rest_framework import serializers
  
  from entitlements.models import CourseEntitlement, CourseEntitlementSupportDetail
  from openedx.core.lib.api.serializers import CourseKeyField
  
  
  class CourseEntitlementSerializer(serializers.ModelSerializer):
      """ Serialize a learner's course entitlement and related information. """
      user = serializers.SlugRelatedField(slug_field='username', queryset=get_user_model().objects.all())
      enrollment_course_run = serializers.CharField(
          source='enrollment_course_run.course_id',
          read_only=True
      )
      support_details = serializers.SerializerMethodField()
  
      def get_support_details(self, model):
          """
          Returns a serialized set of all support interactions with the course entitlement
          """
          qset = CourseEntitlementSupportDetail.objects.filter(entitlement=model).order_by('-created')
          return CourseEntitlementSupportDetailSerializer(qset, many=True).data
  
      class Meta:
          model = CourseEntitlement
          fields = (
              'user',
              'uuid',
              'course_uuid',
              'enrollment_course_run',
              'expired_at',
              'created',
              'modified',
              'mode',
              'order_number',
              'support_details'
          )
  
  
  class CourseEntitlementSupportDetailSerializer(serializers.ModelSerializer):
      """ Serialize the details of a support team interaction with a learner's course entitlement. """
      support_user = serializers.SlugRelatedField(
          read_only=True,
          slug_field='username',
          default=serializers.CurrentUserDefault()
      )
      unenrolled_run = CourseKeyField('unenrolled_run.id')
  
      class Meta:
          model = CourseEntitlementSupportDetail
          fields = (
              'support_user',
              'action',
              'comments',
              'unenrolled_run',
              'created'
          )
  
subject: include created datetime in entitlement support detail serializer