我正在構(gòu)建一個酒店管理系統(tǒng)，我已經(jīng)編寫了一個 check_availability 函數(shù)，該函數(shù)將根據(jù)客戶要求的類別檢查房間是否為空，但事實(shí)證明該函數(shù)忽略了數(shù)據(jù)庫，因?yàn)樗魂P(guān)心現(xiàn)有的一個不是添加的一個。這是代碼：從 django.db 導(dǎo)入模型from django.contrib.auth.models import Userclass RoomCategory(models.Model):    name      = models.CharField(max_length=59)    price     = models.IntegerField()    beds      = models.PositiveIntegerField()    capacity  = models.PositiveIntegerField()    size      = models.CharField(max_length=59)    def __str__(self):        return self.nameclass Room(models.Model):    room_number = models.CharField(max_length=60)    room_category = models.ForeignKey(RoomCategory, on_delete=models.CASCADE)    def __str__(self):        return f"The room {self.room_number} {self.room_category} has a maximum of {self.room_category.capacity} person and cost {self.room_category.price}/night "    class Booking(models.Model):    customer  = models.ForeignKey(User, on_delete=models.CASCADE)    room      = models.ForeignKey(Room, on_delete=models.CASCADE)    check_in  = models.DateTimeField()    check_out = models.DateTimeField()    def __str__(self):        return f"{self.customer} has booked for a {self.room} room from {self.check_in} to {self.check_out}"    from django.shortcuts import renderfrom .forms import BookingFormfrom .models import Booking, RoomCategory, Roomfrom django.views.generic import FormView  from Hotel.Availabililty.Available import check_availabilityfrom django.http import HttpResponse# Create your views here.class BookingFormview(FormView):    form_class      = BookingForm    template_name   = 'Hotel/bookingformview.html'                )