() 缺少 1 个必需的位置参数：'id'

Question

尝试显示单个项目时，我不断收到错误消息。 这是我的代码，我希望它可以理解。我正在使用 django 1.11

1.我的网址页面：

urlpatterns = [
url(r'^$', views.home, name='home'),
url(r'^about/', views.aboutus, name='aboutus'),
url(r'^specialoffers/', views.offers, name='offers'),
url(r'^contactus/', views.contact, name='contact'),
url(r'^excursions/', views.excursions, name='excursions'),
url(r'^singleexcursion/<int:id>/', views.singleexcur, name='singleexcur'),
url(r'^booking/', views.booking, name='booking'),
url(r'^confirmation/', views.confirming, name='confirming'),
url(r'^payment/', views.payment, name='payment'),

]

2. 我的观点页面：

   def singleexcur(请求, id): excur = Excursion.objects.get(id = id)
   return render(request, "excursions/single.html", {"excur": excur })

3. 我的错误：

   /singleexcursion/int:id/ 处出现类型错误 singleexcur() 缺少 1 个必需的位置参数：'id'

Answer 1

处理空 ID 的一个简单方法是使用多个 url 进行游览：

 url(r'^singleexcursion/', views.singleexcur, name='singleexcur'),
 url(r'^singleexcursion/<int:id>/', views.singleexcur, name='singleexcur'),

Answer 2

从 django-2.0 开始，引入了新的语法，这样你就可以编写类似

<int:id>

的参数，但这不适用于 url(..)

 构造，这里你需要用类似正则表达式的方式编写路径语法，因此您可以将 URL 指定为：

# before Django-2.0

urlpatterns = [
    url(r'^$', views.home, name='home'),
    url(r'^about/$', views.aboutus, name='aboutus'),
    url(r'^specialoffers/$', views.offers, name='offers'),
    url(r'^contactus/$', views.contact, name='contact'),
    url(r'^excursions/$', views.excursions, name='excursions'),
    url(r'^singleexcursion/(?P<id>\d+)/', views.singleexcur, name='singleexcur'),
    url(r'^booking/$', views.booking, name='booking'),
    url(r'^confirmation/$', views.confirming, name='confirming'),
    url(r'^payment/$', views.payment, name='payment'),
]

或者在

django-2.0 及更高版本中，您可以使用 path(..)

[Django-doc]。您可以将其与 re_path(..) [Django-doc] 交错，这是 url(..)

 的新名称，因为 

url(..) [Django-doc] 最终可能会被删除。

例如：

# Django-2.0 and above

urlpatterns = [
    re_path(r'^$', views.home, name='home'),
    re_path(r'^about/$', views.aboutus, name='aboutus'),
    re_path(r'^specialoffers/$', views.offers, name='offers'),
    re_path(r'^contactus/$', views.contact, name='contact'),
    re_path(r'^excursions/$', views.excursions, name='excursions'),
    path('singleexcursion/<int:id>/', views.singleexcur, name='singleexcur'),
    re_path(r'^booking/$', views.booking, name='booking'),
    re_path(r'^confirmation/$', views.confirming, name='confirming'),
    re_path(r'^payment/$', views.payment, name='payment'),
]