Question

I want to show an informative error message to a user hitting a page that results in a 403 Forbidden. I'm using Django 1.8.

My idea of passing an error message is this:

# in a view
if not ...:
  raise PermissionDenied('You have no power here')

Then somewhere in the handler403 view, I'd like to retrieve the message (or maybe even a structured object) and render an informative page based on it.

Though the handler seems to only receive the request object and the template name.

Is there a way to pass a custom message to the handler? (Of course I could assign a custom attribute to the request object before raising the exception, and hope that the same object will be passed to the handler, but this feels like a hack.)

Update: Indeed there is a middleware for that already: contrib/messages is capable of piggybacking messages on the request object, and more.

Answer 1

看起来你必须使用中间件来实现它：

class ExceptionMiddleware:
    def process_exception(self, request, exception):
        if exception.args:
            request.message = exception.args[0]

然后在您的handler403中，您可以访问request.message。

显然，你可以充实这个中间件，允许传递的信息不仅仅是一条消息。

Passing a cause description to a 403 handler view

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