.

generic/models.py

@@ -64,6 +64,8 @@ class ExamBase(models.Model):
         help_text="If the json cache needs updating", default=False
     )
 
+    json_creation_time = models.DateTimeField(blank=True)
+
     #time_limit = models.IntegerField(
     #    help_text="Exam time limit (in seconds). Default is 2100 secondse (35 minutes)",
     #    default=2100,

generic/views.py

@@ -32,6 +32,10 @@ from anatomy.models import AnatomyQuestion as AnatomyQuestion
 from anatomy.models import Exam as AnatomyExam
 
 from django.db.models import Case, When
+from django.conf import settings
+
+from datetime import datetime
+import os
 
 
 # Create your views here.
@@ -320,6 +324,8 @@ class ExamViews(View, LoginRequiredMixin):
                         "name": exam.get_exam_name(),
                         "url": request.build_absolute_uri(exam.get_json_url()),
                         "type": self.question_type,
+                        "eid": "{}/{}".format(self.question_type, exam.pk),
+                        "json_creation_time": exam.json_creation_time.isoformat()
                     }
                 )
         
@@ -356,24 +362,36 @@ class ExamViews(View, LoginRequiredMixin):
         if not exam.active:
             raise Http404("No available exam")
 
+
         exam_json_cache = cache.get("{}_exam_json_{}".format(self.app_name, pk))
 
-        if exam_json_cache is not None and not exam.recreate_json:
-            exam_json_cache["cached"] = True
+        path= "{0}{1}/exam/{2}.json".format(settings.MEDIA_ROOT, self.app_name, pk)
+        url= "{0}{1}/exam/{2}.json".format(settings.MEDIA_URL, self.app_name, pk)
+
+
+        if os.path.isfile(path) and not exam.recreate_json:
+            #exam_json_cache["cached"] = True
+            return redirect(url)
             return JsonResponse(exam_json_cache)
 
-        exam_json = exam.get_exam_json()
+
+        with open(path, "w+") as f:
+            exam_json = exam.get_exam_json()
+            exam_json["generated"] = datetime.now().isoformat()
+            f.write(json.dumps(exam_json))
 
         exam.recreate_json = False
+
+        exam.json_creation_time = datetime.now()
         exam.save()
 
         # We also try to clear the cache of any associated questions (longs)
         # see exam_question_json
-        n = exam.exam_questions.count()
-        question_keys = ["{}_exam_json_{}_{}".format(self.app_name, pk, i) for i in range(1, n)]
-        cache.delete_many(question_keys)
+        #n = exam.exam_questions.count()
+        #question_keys = ["{}_exam_json_{}_{}".format(self.app_name, pk, i) for i in range(1, n)]
+        #cache.delete_many(question_keys)
 
-        cache.set("{}_exam_json_{}".format(self.app_name, pk), exam_json, 3600)
+        #cache.set("{}_exam_json_{}".format(self.app_name, pk), exam_json, 3600)
 
         return JsonResponse(exam_json)