add basic (user) history for collections

atlas/models.py

@@ -555,6 +555,14 @@ class SeriesImage(SeriesImageBase):
         help_text="Reference to the object that has replaced this one.",
     )
 
+    def get_file_size(self):
+        try:
+            return self.image.size
+
+        # We catch this for when the image does not exist
+        except FileNotFoundError:
+            return 0
+
     def get_dicom_data(self):
         try:
             with pydicom.dcmread(self.image) as d:
@@ -1066,6 +1074,13 @@ class CaseDetail(models.Model):
         """Returns the correct question answers as a json string"""
         return json.dumps(self.question_answers)
 
+    def get_user_answers(self, user):
+        """Returns the users answers as a json string"""
+        try:
+            return UserReportAnswer.objects.get(question=self, user=user)
+        except UserReportAnswer.DoesNotExist:
+            return None
+
 class CasePrior(models.Model):
     case_detail = models.ForeignKey(CaseDetail, on_delete=models.CASCADE)
     prior_case = models.ForeignKey(Case, on_delete=models.CASCADE, related_name="prior_case")