add exam collections

physics/models.py

@@ -12,7 +12,7 @@ from django.utils.translation import gettext_lazy as _
 
 from sortedm2m.fields import SortedManyToManyField
 
-from generic.models import CidUser, CidUserGroup, ExamBase, ExamUserStatus, QuestionBase, QuestionNote, UserAnswerBase, UserUserGroup
+from generic.models import CidUser, CidUserGroup, ExamBase, ExamCollection, ExamUserStatus, QuestionBase, QuestionNote, UserAnswerBase, UserUserGroup
 
 import reversion
 
@@ -182,6 +182,8 @@ class Exam(ExamBase):
 
     exam_user_status = GenericRelation(ExamUserStatus)
 
+    exam_collection = models.ForeignKey(ExamCollection, blank=True, null=True, on_delete=models.SET_NULL, related_name="physics_exams")
+
     def get_take_url(self):
         return reverse("physics:exam_start", kwargs={"pk": self.pk})