fix data

fixdata.py

@@ -0,0 +1,7 @@
+from item.models import Item
+
+def fix_topic(old, new):
+    for i in Item.objects.all():
+        if old in i.data.get('topics', []):
+            i.data['topics'] = [new if t == old else t for t in i.data['topics']]
+            i.save()