Merge branch 'master' into tranfer_front

# Conflicts:
#	static/js/base.js

apps/note/api/serializers.py

@@ -90,7 +90,7 @@ class NotePolymorphicSerializer(PolymorphicSerializer):
         Note: NoteSerializer,
         NoteUser: NoteUserSerializer,
         NoteClub: NoteClubSerializer,
-        NoteSpecial: NoteSpecialSerializer
+        NoteSpecial: NoteSpecialSerializer,
     }
 
     class Meta:
@@ -177,6 +177,7 @@ class SpecialTransactionSerializer(serializers.ModelSerializer):
         fields = '__all__'
 
 
+# noinspection PyUnresolvedReferences
 class TransactionPolymorphicSerializer(PolymorphicSerializer):
     model_serializer_mapping = {
         Transaction: TransactionSerializer,
@@ -185,5 +186,12 @@ class TransactionPolymorphicSerializer(PolymorphicSerializer):
         SpecialTransaction: SpecialTransactionSerializer,
     }
 
+    try:
+        from activity.models import GuestTransaction
+        from activity.api.serializers import GuestTransactionSerializer
+        model_serializer_mapping[GuestTransaction] = GuestTransactionSerializer
+    except ImportError:  # Activity app is not loaded
+        pass
+
     class Meta:
         model = Transaction