X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/d6f190d50127a1aca615ff505a8a2595b4cfb7de..084f20588e607aa9ae3ed280b6a2f0349b6a3200:/src/isbn/models.py

diff --git a/src/isbn/models.py b/src/isbn/models.py
index a4fa28a4a..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.
 #
@@ -22,7 +21,7 @@ class ISBNPool(models.Model):
     next_suffix = models.IntegerField()
     purpose = models.CharField(max_length=4, choices=PURPOSE_CHOICES)
 
-    def __unicode__(self):
+    def __str__(self):
         return self.prefix
 
     @classmethod
@@ -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)