Merge branch 'fix-metadata-stale-read' into 'master'

Fix stale read when creating a metadata

Closes #495

See merge request !1027

arkindex/documents/serializers/light.py

@@ -125,7 +125,7 @@ class MetaDataLightSerializer(serializers.ModelSerializer):
         element = self.context['element']
         if not (user.is_admin or user.is_internal):
             self.check_allowed(corpus=element.corpus, **validated_data)
-        metadata = element.metadatas.filter(name=validated_data['name'])
+        metadata = element.metadatas.using('default').filter(name=validated_data['name'])
         if metadata.exists():
             if metadata.filter(value=validated_data['value'], type=validated_data['type']).exists():
                 # Raise a 200_OK if a metadata with same type, name and value exists