Login_required determine whether is_authenticate and user login

• Django's user authentication system provides a method request.user.is_authenticated()to determine whether the user is logged in.
• This method returns True or by logging verification: return False.

class UserInfoView(View):
    """用户中心"""

    def get(self, request):
        """提供个人信息界面"""

        # 进行判断: 是否登录验证
        if request.user.is_authenticated():
            # 如果登录, 则正常加载用户中心页面
            return render(request, 'user_center_info.html')
        else:
            # 否则, 进入登录页面,进行登录
            return redirect(reverse('users:login'))

• Django's user authentication system provides login_requiredthe decorator to determine whether the user is logged
  • The inside of the package is_authenticate
  • position:django.contrib.auth.decorators
• Authentication by logging into the interior of the view, view logic performed
• It was not redirected to the login authentication via LOGIN_URLthe configuration item specified address
  • Therefore, the use of the decorators, we need dev.py file, add the following settings: LOGIN_URL = '/login/'
  • Logged-on user to access, or access path

login_requiredusage

1. Direct decorative function view
   • as_view () method is to turn into a class view of the function of view, to use decorative decorator login_required view, return values ​​indirect decorative as_view () method

   # 在子路由中, 给 as_view() 函数,添加装饰器: 
   url(r'^info/$', login_required(views.UserInfoView.as_view()), name='info'),

2. View defined subclasses: a package login_required decorator

# 定义工具类: LoginRequired
# 继承自: View
class LoginRequired(View):
  """验证用户是否登陆的工具类"""

    # 重写 as_view() 函数
    # 在这个函数中, 对 as_view 进行装饰
  @classmethod
  def as_view(cls, **initkwargs):

      # 我们重写这个方法, 不想做任何的修改操作
      # 所以直接调用父类的 super().as_view() 函数.
      view = super().as_view()
      return login_required(view)

Our own view class, let it inherited from LoginRequired

class UserInfoView(LoginRequired):
    """用户中心接口"""

    def get(self, request):
        """提供个人信息界面"""
        return render(request, 'user_center_info.html')

• Not recommended : tools directly dependent on the view class View, so relatively poor reusability.

3. inherited from the object.

# 我们定义的工具类: 
# 继承自 object
class LoginRequired(object):
  """验证用户是否登陆的工具类"""

  # 重写该函数: 
  @classmethod
  def as_view(cls, **initkwargs):
      # 调用父类的 as_view() 方法
      view = super().as_view()
      # 添加装饰行为: 
      return login_required(view)

Define our own class view, it needs to inherit from: Tools + View

class UserInfoView(LoginRequired, View):
    """用户中心"""

    def get(self, request):
        """提供个人信息界面"""
        return render(request, 'user_center_info.html')