不允许的方法（GET）：/在django中

Question

from django.views.generic import View
from django.http import HttpResponse

class home(View):
  def post(self,request):
    return HttpResponse('Class based view')

当我尝试定义上述方法时，它说不允许方法（GET）：/

任何人都可以帮我解决这个问题吗？

Answer 1

在您的代码中，您定义了post方法，但没有get处理GET请求的方法。您可以像这样进行修复，例如：

class home(View):
    def get(self, request):
       return HttpResponse('Class based view')

    def post(self,request):
      return HttpResponse('Class based view')

在此处查看基于类的视图的使用：https : //docs.djangoproject.com/en/2.1/topics/class-based-views/intro/#using-class-based-views

Answer 2

根据 View 的调度方法，您可以在这里找到：- https://ccbv.co.uk/projects/Django/2.0/django.views.generic.base/View/

def dispatch(self, request, *args, **kwargs):
    # Try to dispatch to the right method; if a method doesn't exist,
    # defer to the error handler. Also defer to the error handler if the
    # request method isn't on the approved list.
    if request.method.lower() in self.http_method_names:
        handler = getattr(self, request.method.lower(), self.http_method_not_allowed)
    else:
        handler = self.http_method_not_allowed
    return handler(request, *args, **kwargs)

如果View中没有定义get方法，那么dispatch会调用self.http_method_not_allowed

def http_method_not_allowed(self, request, *args, **kwargs):
    logger.warning(
        'Method Not Allowed (%s): %s', request.method, request.path,
        extra={'status_code': 405, 'request': request}
    )
    return HttpResponseNotAllowed(self._allowed_methods())

这里，

if request.method.lower() in self.http_method_names:
    handler = getattr(self, request.method.lower(), self.http_method_not_allowed)

在这段代码中，if条件会通过，但是当它尝试对self执行getattr时，request.method.lower()有get作为值，所以getattr不会找到get方法，因为我们还没有定义它，所以getattr 将返回 http_method_not_allowed