Implement My Tickets view in public helpdesk

Note: This is a breaking change as it forces pagination on the API endoints.
This should have been done from the start as the API without pagination is
useless when there are large numbers of tickets.

helpdesk/views/api.py

@@ -1,10 +1,29 @@
 from django.contrib.auth import get_user_model
 from helpdesk.models import FollowUp, FollowUpAttachment, Ticket
-from helpdesk.serializers import FollowUpAttachmentSerializer, FollowUpSerializer, TicketSerializer, UserSerializer
+from helpdesk.serializers import FollowUpAttachmentSerializer, FollowUpSerializer, TicketSerializer, UserSerializer, PublicTicketListingSerializer
 from rest_framework import viewsets
 from rest_framework.mixins import CreateModelMixin
 from rest_framework.permissions import IsAdminUser
 from rest_framework.viewsets import GenericViewSet
+from rest_framework.pagination import PageNumberPagination
+
+
+class ConservativePagination(PageNumberPagination):
+    page_size = 25
+    page_size_query_param = 'page_size'
+
+
+class UserTicketViewSet(viewsets.ReadOnlyModelViewSet):
+    """
+    A list of all the tickets submitted by the current user
+
+    The view is paginated by default
+    """
+    serializer_class = PublicTicketListingSerializer
+    pagination_class = ConservativePagination
+
+    def get_queryset(self):
+        return Ticket.objects.filter(submitter_email=self.request.user.email).order_by('-created')
 
 
 class TicketViewSet(viewsets.ModelViewSet):
@@ -13,6 +32,7 @@ class TicketViewSet(viewsets.ModelViewSet):
     """
     queryset = Ticket.objects.all()
     serializer_class = TicketSerializer
+    pagination_class = ConservativePagination
     permission_classes = [IsAdminUser]
 
     def get_queryset(self):
@@ -30,12 +50,14 @@ class TicketViewSet(viewsets.ModelViewSet):
 class FollowUpViewSet(viewsets.ModelViewSet):
     queryset = FollowUp.objects.all()
     serializer_class = FollowUpSerializer
+    pagination_class = ConservativePagination
     permission_classes = [IsAdminUser]
 
 
 class FollowUpAttachmentViewSet(viewsets.ModelViewSet):
     queryset = FollowUpAttachment.objects.all()
     serializer_class = FollowUpAttachmentSerializer
+    pagination_class = ConservativePagination
     permission_classes = [IsAdminUser]