.

generic/migrations/0015_ciduser_ciduserexam.py

@@ -0,0 +1,34 @@
+# Generated by Django 3.2.8 on 2021-12-11 12:47
+
+from django.db import migrations, models
+import django.db.models.deletion
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('contenttypes', '0002_remove_content_type_name'),
+        ('generic', '0014_alter_questionnote_note'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CidUser',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('cid', models.IntegerField(blank=True, null=True)),
+                ('passcode', models.CharField(blank=True, max_length=50)),
+            ],
+        ),
+        migrations.CreateModel(
+            name='CidUserExam',
+            fields=[
+                ('id', models.AutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('object_id', models.PositiveIntegerField()),
+                ('start_time', models.DateTimeField(blank=True, null=True)),
+                ('end_time', models.DateTimeField(blank=True, null=True)),
+                ('cid_user', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='generic.ciduser')),
+                ('content_type', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, to='contenttypes.contenttype')),
+            ],
+        ),
+    ]

generic/models.py

@@ -94,6 +94,7 @@ class ExamBase(models.Model):
         default=False,
     )
 
+
     # time_limit = models.IntegerField(
     #    help_text="Exam time limit (in seconds). Default is 2100 secondse (35 minutes)",
     #    default=2100,
@@ -190,6 +191,9 @@ class CidUser(models.Model):
     cid = models.IntegerField(blank=True, null=True)
     passcode = models.CharField(blank=True, max_length=50)
 
+    def __str__(self) -> str:
+        return self.cid
+
 class CidUserExam(models.Model):
     content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     object_id = models.PositiveIntegerField()
@@ -199,3 +203,4 @@ class CidUserExam(models.Model):
     end_time = models.DateTimeField(blank=True, null=True)
 
     cid_user = models.ForeignKey(CidUser, on_delete=models.CASCADE)
+

physics/migrations/0015_exam_valid_users.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.2.8 on 2021-12-11 13:01
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('generic', '0015_ciduser_ciduserexam'),
+        ('physics', '0014_alter_exam_open_access'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='exam',
+            name='valid_users',
+            field=models.ManyToManyField(blank=True, related_name='physics_exams', to='generic.CidUser'),
+        ),
+    ]

physics/models.py

@@ -12,7 +12,7 @@ from django.utils.translation import ugettext_lazy as _
 
 from sortedm2m.fields import SortedManyToManyField
 
-from generic.models import ExamBase, QuestionNote
+from generic.models import CidUser, ExamBase, QuestionNote
 
 import reversion
 
@@ -154,6 +154,7 @@ class Exam(ExamBase):
                                     help_text='Author of exam',
                                     related_name="physics_exam_author")
 
+    valid_users = models.ManyToManyField(CidUser, blank=True, related_name="physics_exams")
 
 
 @reversion.register

physics/views.py

@@ -315,13 +315,19 @@ def exam_finish(request, pk, cid):
     )
 
 
-def exam_take(request, pk, sk, cid):
+def exam_take(request, pk, sk, cid, passcode=None):
 
     exam = get_object_or_404(Exam, pk=pk)
 
     if not exam.active:
         raise Http404("Exam not found")
 
+    if exam.valid_users is not None:
+        user = exam.valid_users.filter(cid=cid)
+
+        if not user or user.passcode != passcode:
+            raise Http404("Exam not found")
+
     question = exam.exam_questions.all()[sk]
 
     exam_length = len(exam.exam_questions.all())