public async Task <IActionResult> FollowTrip(int schoolId, int tripId, int id)
        {
            if (await userService.FollowTrip(schoolId, tripId, id))
            {
                var tripFollow = await database.UserRepository.GetTripFollow(tripId, id);

                if (tripFollow == null)
                {
                    throw new EntityNotFoundException();
                }

                var tripFollowToReturn = mapper.Map <TripFollowDetailsDto>(tripFollow);

                await notificationSystem.PushNotification(tripFollow.Trip.School.OwnerId, StaticExpressions.NewTripFollow(tripFollow.User.UserName, tripFollow.Trip.Name));

                return(Ok(tripFollowToReturn));
            }

            return(BadRequest("Nie udało się dodać wycieczki do listy ulubionych"));
        }