Question

When user is not logged in, he should be redirected to the login page.

if not request.user.is_authenticated()
    # redirect to the login page

But this code must be written in each view. There is a way to write common code for all views only one time?

Answer 1

You could do it with a piece of middleware:

class RequireLoginMiddleware(object):
    def process_request(self, request):
        if not request.user.is_authenticated():
            return HttpResponseRedirect('/login/')
        return None

Of course, you don’t want to do that for the login page itself:

class RequireLoginMiddleware(object):
    def process_request(self, request):
        if request.path.startswith('/login'):
            return None
        if not request.user.is_authenticated():
            return HttpResponseRedirect('/login/')
        return None