finance logging

finance/models.py

@@ -32,7 +32,7 @@ class Bill(models.Model):
             log = False
             try:
                 p = Progress.objects.get(user=self.user, course_token=str(self.course_token))
-                p.freeze = True
+                p.is_freeze = True
                 p.save()
             except Progress.DoesNotExist:
                 log = True