Prevent retrieving each case when getting an itinerary

app/apps/cases/serializers.py

@@ -51,35 +51,3 @@ def get_data(self, obj):
             if data is not None:
                 return data
         return obj.data_context(self.context)
-
-
-class CaseDetailSerializer(serializers.ModelSerializer):
-    class Meta:
-        model = Case
-        fields = ()
-
-    def to_representation(self, obj):
-        """
-        Retrieves the full case data from the cache or data_context,
-        but reduces workflows to a list containing only state.name.
-        """
-
-        cache = self.context.get("cases_data_cache")
-
-        if cache is not None:
-            data = cache.get(str(obj.case_id))
-        else:
-            data = obj.data_context(self.context)
-
-        if not isinstance(data, dict):
-            return {}
-
-        # Transformeer workflows naar alleen de namen
-        workflows = data.get("workflows", [])
-        data["workflows"] = [
-            wf["state"]["name"]
-            for wf in workflows
-            if "state" in wf and "name" in wf["state"]
-        ]
-
-        return data

app/apps/itinerary/serializers.py

@@ -1,9 +1,5 @@
 from apps.cases.models import Case
-from apps.cases.serializers import (
-    CaseDetailSerializer,
-    CaseSerializer,
-    CaseSimpleSerializer,
-)
+from apps.cases.serializers import CaseSerializer, CaseSimpleSerializer
 from apps.itinerary.models import (
     Itinerary,
     ItineraryItem,
@@ -222,7 +218,33 @@ def get_theme(self, obj):
 
 
 class ItineraryItemDetailSerializer(ItineraryItemSerializer):
-    case = CaseDetailSerializer(read_only=True)
+    case = serializers.SerializerMethodField()
+
+    def get_case(self, obj):
+        return self._serialize_case(obj)
+
+    def _serialize_case(self, obj):
+        cache = self.context.get("cases_data_cache")
+
+        if cache is not None:
+            data = cache.get(str(obj.case.case_id))
+        else:
+            data = obj.case.data_context(self.context)
+
+        if not isinstance(data, dict):
+            return {}
+
+        workflows = data.get("workflows", [])
+        data["workflows"] = [
+            wf["state"]["name"]
+            for wf in workflows
+            if isinstance(wf, dict)
+            and "state" in wf
+            and isinstance(wf["state"], dict)
+            and "name" in wf["state"]
+        ]
+
+        return data
 
 
 class ItineraryDetailSerializer(ItinerarySerializer):

app/apps/itinerary/views.py

@@ -69,6 +69,28 @@ def get_object(self):
         except Http404:
             raise NotFound(MESSAGE)
 
+    def retrieve(self, request, *args, **kwargs):
+        user = get_object_or_404(User, id=request.user.id)
+        itinerary = Itinerary.objects.filter(
+            id=kwargs["pk"], team_members__user=user
+        ).first()
+        if not itinerary:
+            return Response({"detail": "Not authorized."}, status=403)
+        item_qs = ItineraryItem.objects.filter(itinerary=itinerary)
+        case_ids = list(item_qs.values_list("case__case_id", flat=True))
+
+        auth_header = get_auth_header_from_request(request)
+        cases_data_cache = fetch_cases_data(case_ids, auth_header)
+
+        serializer = self.get_serializer(
+            itinerary,
+            context={
+                **self.get_serializer_context(),
+                "cases_data_cache": cases_data_cache,
+            },
+        )
+        return Response(serializer.data)
+
     def __get_all_itineraries__(self, user, date=None):
         itineraries = Itinerary.objects.filter(team_members__user=user)