#models.py
class Ticket(models.Model)
 #auto pk
 handle = models.CharField(max_length=255)
class Task(models.Model)
 #auto pk
 label = models.CharField(max_length=255)
 ticket = models.ForeignKey(Ticket, blank=True, null=True)
#views.py
class TicketViewSet(viewsets.ReadOnlyModelViewSet):
 queryset = Ticket.objects.all()
 serializer_class = serializers.TicketSerializer
 resource_name = 'service-now-ticket'
class TaskViewSet(viewsets.ModelViewSet):
 queryset = Task.objects.all()
 serializer_class = serializers.TaskSerializer
 resource_name = 'task'
#serializers.py
from rest_framework_json_api import serializers
class TicketSerializer(serializers.ModelSerializer):
 class Meta:
 model = models.Ticket
 fields = (
 'id',
 'handle',
 )
class TaskSerializer(serializers.ModelSerializer):
 ticket = serializers.ResourceRelatedField(read_only=True)
 class Meta:
 model = models.Task
 field = (
 'id',
 'label',
 'ticket',
 )

{
 "data": {
 "type": "task",
 "id": "126",
 "attributes": {
 "label": "This is a task"
 },
 "relationships": {
 "ticket": {
 "data": {
 "type": "service-now-tickets",
 "id": "91734"
 }
 }
 }
 }
}

{
 "data": {
 "type": "task",
 "id": "126",
 "attributes": {
 "label": "This is a task"
 },
 "relationships": {
 "ticket": {
 "data": {
 "type": "tickets",
 "id": "91734"
 }
 }
 }
 }
}