Fix: setting new value for existing key now works

Author: oliviersels

keyvaluestore/utils.py

@@ -4,7 +4,7 @@ def get_value_for_key(key):
     return KeyValueStore.objects.get_value_for_key(key)
 
 def set_key_value(key, value):
-    obj,created = KeyValueStore.objects.get_or_create(key=key, value=value)
+    obj,created = KeyValueStore.objects.get_or_create(key=key, defaults={'value': value})
     if not created:
         obj.value = value
         obj.save()