需要帮助创建一个装饰器来强制存在会话数据

Question

我想为我的Django视图创建一个装饰器，以确保某些数据片段在我的会话中。如果他们在那里，你可以看到视图，如果他们不在那里，你会被重定向到插入到会话中的另一个视图。

我很纳闷：

1. 使用装饰正确的方法，或者我应该利用中间件...
2. 有人可以提供一个例子吗？

感谢

Answer 1

装饰器无疑是最有意义的，我认为。查看@login_required装修厂商的代码：

def user_passes_test(test_func, login_url=None, redirect_field_name=REDIRECT_FIELD_NAME): 
    """ 
    Decorator for views that checks that the user passes the given test, 
    redirecting to the log-in page if necessary. The test should be a callable 
    that takes the user object and returns True if the user passes. 
    """ 

    def decorator(view_func): 
     @wraps(view_func, assigned=available_attrs(view_func)) 
     def _wrapped_view(request, *args, **kwargs): 
      if test_func(request.user): 
       return view_func(request, *args, **kwargs) 
      path = request.build_absolute_uri() 
      # If the login url is the same scheme and net location then just 
      # use the path as the "next" url. 
      login_scheme, login_netloc = urlparse.urlparse(login_url or 
                 settings.LOGIN_URL)[:2] 
      current_scheme, current_netloc = urlparse.urlparse(path)[:2] 
      if ((not login_scheme or login_scheme == current_scheme) and 
       (not login_netloc or login_netloc == current_netloc)): 
       path = request.get_full_path() 
      from django.contrib.auth.views import redirect_to_login 
      return redirect_to_login(path, login_url, redirect_field_name) 
     return _wrapped_view 
    return decorator 


def login_required(function=None, redirect_field_name=REDIRECT_FIELD_NAME, login_url=None): 
    """ 
    Decorator for views that checks that the user is logged in, redirecting 
    to the log-in page if necessary. 
    """ 
    actual_decorator = user_passes_test(
     lambda u: u.is_authenticated(), 
     login_url=login_url, 
     redirect_field_name=redirect_field_name 
    ) 
    if function: 
     return actual_decorator(function) 
    return actual_decorator