如何检查开始日期和结束日期是否需要然后引发错误 django

如何解决如何检查开始日期和结束日期是否需要然后引发错误 django

我正在为一家酒店做一个项目，例如我必须防止选择错误的日期

check_in = 27-6-2021 2:30PM 
check_out = 30-6-2021 2:30PM 

我想防止在这两个日期中选择任何日期，例如 check_in=28-6-2021 2:30PM check_out=2-7-2021 2:30PM 等等.. 这是我的 Booking 模型

class Booking(models.Model):
    admin = models.ForeignKey(User,on_delete=models.CASCADE)
    room_no = models.ForeignKey(Room,on_delete=models.CASCADE,blank=True,related_name='rooms')
    takes_by = models.ManyToManyField(Vistor)
    check_in = models.DateTimeField(default=datetime.Now)
    check_out = models.DateTimeField()

#my form

class BookingForm(forms.ModelForm):
    takes_by = forms.ModelMultipleChoiceField(queryset=Vistor.objects.all())
    check_in = forms.DateTimeField(required=True,input_formats=['%Y-%m-%dT%H:%M','%Y-%m-%dT%H:M%Z'],widget=forms.DateTimeInput(attrs={'type':'datetime-local'}))
    check_out = forms.DateTimeField(required=True,widget=forms.DateTimeInput(attrs={'type':'datetime-local'}))
    class Meta:
        model = Booking
        fields = ['takes_by','check_in','check_out']

我的views.py

@login_required
def add_booking(request,room_no):
   room_number = get_object_or_404(Room,room_no=room_no)
   if request.method == 'POST':
        form = BookingForm(request.POST)
        if form.is_valid():
            obj = form.save(commit=False)
            obj.room_no = room_number
            obj.admin = request.user
            obj.save()  
            messages.success(request,f'room number {room_number} added')
   form = BookingForm()

   return render(request,'booking/add_booking.html',{'form':form,'room_number':room_number})

我应该怎么做才能防止在现有日期中两次占用一个房间？ 非常感谢

解决方法

您可以像这样检查特定房间的入住退房是否已经存在。

from django.db.models import Q

def add_booking(request,room_no):
   room_number = get_object_or_404(Room,room_no=room_no)
   if request.method == 'POST':
      form = BookingForm(request.POST)
      if form.is_valid():
          check_in = form.cleaned_data.get('check_in')
          check_out = form.cleaned_data.get('check_out')
          if room_number.rooms.filter(Q(check_in_gte=check_in)|Q(check_out_lte=check_out)).exists():
              return HttpResponse('invalid check in out date')
          obj = form.save(commit=False)
          obj.room_no = room_number
          obj.admin = request.user
          obj.save()  

,

您可以在表单中使用 clear 函数：

        def clean_check_in(self):
    check_in = self.cleaned_data['check_in']
    excluded_date_start = #the begining date of exclusion
    excluded_date_end =  # the end date of exclusion

    if check_in > excluded_date_start and check_in < excluded_date_end :
        raise ValidationError("not possible to book")

    return check_in