akceptacje rezerwacji

    @PostMapping("/{id}")
    fun update(@PathVariable("id") id: Long, @RequestBody form: ReservationChangeForm) {
        val optional = reservationsRepository.findById(id)

        if (!optional.isPresent) {
            ErrorMessages.RESERVATION_NOT_FOUND.response()
        }

        val reservation = optional.get()
        when (form.status) {
            ACCEPTED -> reservation.accept()
            CANCELLED -> reservation.cancel()
            REJECTED -> reservation.reject()
            PENDING -> ErrorMessages.RESERVATION_STATUS_NOT_PERMITED.response()
        }
        reservationsRepository.save(reservation)
    }