device/models.py

@@ -129,7 +129,8 @@ class Device:
         return self.uuids[0]
 
     def get_lots(self):
-        self.lots = [x.lot for x in DeviceLot.objects.filter(device_id=self.id)]
+        self.lots = [
+            x.lot for x in DeviceLot.objects.filter(device_id=self.id)]
 
     @classmethod
     def get_unassigned(cls, institution, offset=0, limit=None):
@@ -179,7 +180,6 @@ class Device:
         count = cls.get_unassigned_count(institution)
         return devices, count
 
-
     @classmethod
     def get_unassigned_count(cls, institution):
 
@@ -279,6 +279,12 @@ class Device:
             self.get_last_evidence()
         return self.last_evidence.get_manufacturer()
 
+    @property
+    def serial_number(self):
+        if not self.last_evidence:
+            self.get_last_evidence()
+        return self.last_evidence.get_serial_number()
+
     @property
     def type(self):
         if self.last_evidence.doc['type'] == "WebSnapshot":