.

anatomy/migrations/0035_exam_json_creation_time.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.3 on 2021-03-09 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('anatomy', '0034_auto_20210215_1200'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='exam',
+            name='json_creation_time',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]

generic/models.py

@@ -64,7 +64,7 @@ class ExamBase(models.Model):
         help_text="If the json cache needs updating", default=False
     )
 
-    json_creation_time = models.DateTimeField(blank=True)
+    json_creation_time = models.DateTimeField(blank=True, default=None, null=True)
 
     #time_limit = models.IntegerField(
     #    help_text="Exam time limit (in seconds). Default is 2100 secondse (35 minutes)",

generic/views.py

@@ -319,13 +319,17 @@ class ExamViews(View, LoginRequiredMixin):
 
         for exam in exams:
             if exam.active:
+                if exam.json_creation_time:
+                    creation_time = exam.json_creation_time.isoformat()
+                else:
+                    creation_time = "None"
                 active_exams["exams"].append(
                     {
                         "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()
+                        "json_creation_time": creation_time
                     }
                 )
         

longs/migrations/0031_auto_20210309_1527.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.1.3 on 2021-03-09 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('longs', '0030_long_recreate_json'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='exam',
+            name='json_creation_time',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+        migrations.AddField(
+            model_name='long',
+            name='json_creation_time',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]

longs/models.py

@@ -120,7 +120,7 @@ class Long(models.Model):
         help_text="If the json cache needs updating", default=False
     )
 
-    json_creation_time = models.DateTimeField(blank=True)
+    json_creation_time = models.DateTimeField(blank=True, default=None, null=True)
 
     #question_file = models.FileField(upload_to=question_file_directory_path, blank=True, null=True)
 

physics/migrations/0004_exam_json_creation_time.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.3 on 2021-03-09 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('physics', '0003_auto_20201228_2235'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='exam',
+            name='json_creation_time',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]

rapids/migrations/0020_exam_json_creation_time.py

@@ -0,0 +1,18 @@
+# Generated by Django 3.1.3 on 2021-03-09 15:27
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('rapids', '0019_auto_20210215_1203'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='exam',
+            name='json_creation_time',
+            field=models.DateTimeField(blank=True, default=None, null=True),
+        ),
+    ]