partial void AddBuildingFields(ISubscriptionService <Building> buildingService)
 {
     AddField(new EventStreamFieldType
     {
         Name       = "buildingChanged",
         Type       = typeof(MutationResponseType <Building, BuildingType>),
         Resolver   = new FuncFieldResolver <MutationResponse <Building> >((context) => context.Source as MutationResponse <Building>),
         Subscriber = new EventStreamResolver <MutationResponse <Building> >((context) =>
         {
             return(buildingService.Entities());
         })
     });
 }