public WeekType(IWeekService weekService, IWeekUserLinkService weekUserLinkService, IUserService userService)
{
FieldAsync <DecimalGraphType>("costPerUser", "The amount owed per user", resolve: async context => await weekService.GetAmountToPayPerPersonAsync(context.Source.WeekId));
FieldAsync <ListGraphType <WeekUserLinkType> >("users", resolve: async context => await weekUserLinkService.GetByWeekIdAsync(context.Source.WeekId));
FieldAsync <UserType>("shopper", resolve: async context => context.Source.ShopperUserId.HasValue ? await userService.GetByIdAsync(context.Source.ShopperUserId.Value) : null);
}