basic json caching

anatomy/views.py

@@ -8,7 +8,8 @@ from django.contrib.auth.models import User
 
 from django.db.models.functions import Lower
 
-from django.http import Http404, JsonResponse
+from django.core.cache import cache
+
 
 from .forms import AnatomyAnswerForm, MarkAnatomyQuestionForm
 from .models import (
@@ -453,11 +454,18 @@ def active_exams(request):
 
 
 def exam_json(request, pk):
+
     exam = get_object_or_404(Exam, pk=pk)
 
     if not exam.active:
         raise Http404("No available exam")
 
+    exam_json_cache = cache.get("exam_json_{}".format(pk))
+
+    if exam_json_cache is not None and not exam.recreate_json:
+        return JsonResponse(exam_json)
+
+
     questions = exam.exam_questions.all()
 
     exam_questions = defaultdict(dict)
@@ -470,13 +478,18 @@ def exam_json(request, pk):
             "type": "anatomy",
         }
 
-        exam_json = {
-            "eid": exam.id,
-            "exam_type": "anatomy",
-            "exam_name": exam.name,
-            "exam_mode": True,
-            "questions": exam_questions,
-        }
+    exam_json = {
+        "eid": exam.id,
+        "exam_type": "anatomy",
+        "exam_name": exam.name,
+        "exam_mode": True,
+        "questions": exam_questions,
+    }
+
+    exam.recreate_json = False
+
+    cache.set("exam_json_{}".format(pk), exam_json, 3600)
+
     return JsonResponse(exam_json)