Django获取优惠券代码并检查该代码的另一列中的布尔值("is available")

from django.db import models

class Coupon(models.Model):
    code = models.CharField(max_length=50)
    is_available = models.BooleanField(default=True)

from django.shortcuts import get_object_or_404
from django.http import JsonResponse

def check_coupon(request, code):
    coupon = get_object_or_404(Coupon, code=code)
    is_available = coupon.is_available
    return JsonResponse({'is_available': is_available})

from django.urls import path
from .views import check_coupon

urlpatterns = [
    path('coupon/<str:code>/', check_coupon, name='check_coupon'),
]