X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/8952b9530d943655e552ea660c47e850123c5105..94a4fcc7ab9e1713dc2defc8b35c875fc90f6fa5:/src/api/models.py

diff --git a/src/api/models.py b/src/api/models.py
index 28bc8807d..ffa4f9be2 100644
--- a/src/api/models.py
+++ b/src/api/models.py
@@ -6,7 +6,7 @@ from django.contrib.auth.models import User
 from django.contrib.contenttypes.models import ContentType
 from django.db import models
 from django.db.models.signals import pre_delete
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 from catalogue.models import Book, Tag
 
@@ -50,6 +50,9 @@ class BookUserData(models.Model):
     complete = models.BooleanField(default=False)
     last_changed = models.DateTimeField(auto_now=True)
 
+    class Meta:
+        unique_together = [('user', 'book')]
+
     @property
     def state(self):
         return 'complete' if self.complete else 'reading'