X-Git-Url: https://git.mdrn.pl/redakcja.git/blobdiff_plain/2caa6415139fe58938a62dca695639ba0cc86dda..e22b691a1c2ac0e1aba750771cd17f032f47c172:/src/catalogue/wikidata.py

diff --git a/src/catalogue/wikidata.py b/src/catalogue/wikidata.py
index c6885705..d97d3af7 100644
--- a/src/catalogue/wikidata.py
+++ b/src/catalogue/wikidata.py
@@ -1,3 +1,6 @@
+# This file is part of FNP-Redakcja, licensed under GNU Affero GPLv3 or later.
+# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
+#
 from datetime import date
 from django.db import models
 from django.db.models.signals import m2m_changed
@@ -11,9 +14,7 @@ from wikidata.datavalue import DatavalueError
 class WikidataMixin(models.Model):
     wikidata = models.CharField(
         max_length=255,
-        null=True,
         blank=True,
-        unique=True,
         help_text=_('If you have a Wikidata ID, like "Q1337", enter it and save.'),
     )
 
@@ -89,7 +90,11 @@ class WikidataAdminMixin:
 
     def wikidata_link(self, obj):
         if obj.wikidata:
-            return format_html('<a href="https://www.wikidata.org/wiki/{wd}" target="_blank">{wd}</a>', wd=obj.wikidata)
+            return format_html(
+                '<a href="https://www.wikidata.org/wiki/{wd}" target="_blank">{wd}</a>',
+                wd=obj.wikidata,
+            )
         else:
-            return ''
-    wikidata_link.admin_order_field = 'wikidata'
+            return ""
+
+    wikidata_link.admin_order_field = "wikidata"