Exam models date_created updates

kolibri/core/exams/api.py

@@ -1,3 +1,5 @@
+import datetime
+
 from django.http import Http404
 from django.utils.timezone import now
 from django_filters.rest_framework import DjangoFilterBackend
@@ -152,9 +154,10 @@ def list(self, request, *args, **kwargs):
 
         # Consolidate the exam_queryset and draft_queryset
         # and sort them by reverse date_created
+        dt_utc_aware = datetime.datetime.fromtimestamp(0, datetime.timezone.utc)
         all_objects = sorted(
             [*exam_objects, *draft_objects],
-            key=lambda x: x["date_created"],
+            key=lambda x: x["date_created"] or dt_utc_aware,
             reverse=True,
         )
 

kolibri/core/exams/migrations/0009_alter_exam_date_created.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.25 on 2024-07-03 21:46
+import django.utils.timezone
+from django.db import migrations
+from django.db import models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("exams", "0008_draft_exams"),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name="exam",
+            name="date_created",
+            field=models.DateTimeField(default=django.utils.timezone.now),
+        ),
+    ]

kolibri/core/exams/models.py

@@ -158,8 +158,6 @@ class Meta:
     """
     data_model_version = models.SmallIntegerField(default=3)
 
-    date_created = models.DateTimeField(auto_now_add=True, null=True)
-
     def __str__(self):
         return self.title
 
@@ -196,6 +194,8 @@ class DraftExam(AbstractExam):
     assignments = JSONField(default=list, blank=True)
     learner_ids = JSONField(default=list, blank=True)
 
+    date_created = models.DateTimeField(auto_now_add=True, null=True)
+
     def to_exam(self):
         """
         Convert this draft exam to an exam object.
@@ -235,7 +235,7 @@ class Exam(AbstractExam, AbstractFacilityDataModel):
     # Is this exam currently active and visible to students to whom it is assigned?
     active = models.BooleanField(default=False)
 
-    date_created = models.DateTimeField(null=True)
+    date_created = models.DateTimeField(default=timezone.now)
 
     # To be set True when the quiz is first set to active=True
     date_activated = models.DateTimeField(default=None, null=True, blank=True)