X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/967eed676fc83d15b26149047f353ac61faa8217..8861d28c171c5d759253c6b9ab48b7b10c40858c:/src/isbn/models.py

diff --git a/src/isbn/models.py b/src/isbn/models.py
index ca8dbee15..d65ca606c 100644
--- a/src/isbn/models.py
+++ b/src/isbn/models.py
@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
 #
@@ -53,7 +52,7 @@ class ISBNPool(models.Model):
 
 
 class ONIXRecord(models.Model):
-    isbn_pool = models.ForeignKey(ISBNPool)
+    isbn_pool = models.ForeignKey(ISBNPool, models.PROTECT)
     datestamp = models.DateField(auto_now=True)
     suffix = models.IntegerField()
     product_form = models.CharField(max_length=4)