feat(itim): Add Problem Ticket API v2 endpoint

ref: #248 #377

app/itim/viewsets/index.py

@@ -28,7 +28,7 @@ class Index(CommonViewSet):
                 "change": reverse('v2:_api_v2_ticket_change-list', request=request),
                 "cluster": reverse('v2:_api_v2_cluster-list', request=request),
                 "incident": reverse('v2:_api_v2_ticket_incident-list', request=request),
-                "problem": "ToDo",
+                "problem": reverse('v2:_api_v2_ticket_problem-list', request=request),
                 "service": reverse('v2:_api_v2_service-list', request=request),
             }
         )

app/itim/viewsets/problem.py

@@ -0,0 +1,83 @@
+from drf_spectacular.utils import (
+    extend_schema,
+    extend_schema_view,
+    OpenApiResponse,
+    PolymorphicProxySerializer,
+)
+
+from itim.serializers.problem import (
+    ProblemAddTicketModelSerializer,
+    ProblemChangeTicketModelSerializer,
+    ProblemImportTicketModelSerializer,
+    ProblemTriageTicketModelSerializer,
+    ProblemTicketViewSerializer,
+)
+
+from core.viewsets.ticket import TicketViewSet
+
+
+
+@extend_schema_view(
+    create=extend_schema(
+        summary = 'Create a Problem Ticket',
+        description='',
+        request = PolymorphicProxySerializer(
+            component_name = 'ProblemTicket',
+            serializers=[
+                ProblemImportTicketModelSerializer,
+                ProblemAddTicketModelSerializer,
+                ProblemChangeTicketModelSerializer,
+                ProblemTriageTicketModelSerializer,
+            ],
+            resource_type_field_name=None,
+            many = False
+        ),
+        responses = {
+            201: OpenApiResponse(description='Created', response=ProblemTicketViewSerializer),
+            403: OpenApiResponse(description='User is missing add permissions'),
+        }
+    ),
+    destroy = extend_schema(
+        summary = 'Delete a Problem Ticket',
+        description = '',
+        responses = {
+            204: OpenApiResponse(description=''),
+            403: OpenApiResponse(description='User is missing delete permissions'),
+        }
+    ),
+    list = extend_schema(
+        summary = 'Fetch all Problem Tickets',
+        description='',
+        responses = {
+            200: OpenApiResponse(description='', response=ProblemTicketViewSerializer),
+            403: OpenApiResponse(description='User is missing view permissions'),
+        }
+    ),
+    retrieve = extend_schema(
+        summary = 'Fetch a Problem Ticket',
+        description='',
+        responses = {
+            200: OpenApiResponse(description='', response=ProblemTicketViewSerializer),
+            403: OpenApiResponse(description='User is missing view permissions'),
+        }
+    ),
+    update = extend_schema(exclude = True),
+    partial_update = extend_schema(
+        summary = 'Update a Problem Ticket',
+        description = '',
+        responses = {
+            200: OpenApiResponse(description='', response=ProblemTicketViewSerializer),
+            403: OpenApiResponse(description='User is missing change permissions'),
+        }
+    ),
+)
+class ViewSet(TicketViewSet):
+    """Problem Ticket
+
+    This class exists only for the purpose of swagger for documentation.
+
+    Args:
+        TicketViewSet (class): Base Ticket ViewSet.
+    """
+
+    _ticket_type: str = 'Problem'