add exam collections

longs/models.py

@@ -28,6 +28,7 @@ from helpers.images import image_as_base64, pretty_print_dicom
 from generic.models import (
     CidUser,
     CidUserGroup,
+    ExamCollection,
     ExamUserStatus,
     Examination,
     ExamBase,
@@ -465,6 +466,8 @@ class Exam(ExamBase):
 
     exam_user_status = GenericRelation(ExamUserStatus)
 
+    exam_collection = models.ForeignKey(ExamCollection, blank=True, null=True, on_delete=models.SET_NULL, related_name="longs_exams")
+
     def get_exam_question_json(self, question_id):
         q = get_object_or_404(Long, pk=question_id)