“is_authenticated”是什么意思? Flask-Login中使用的方法? [英] What's the point of the "is_authenticated" method used in Flask-Login?
问题描述
我正在通过Flask Mega-Tutorial进行工作, class User(db.Model):
id = db.Column(db.Integer,primary_key = True)
nickname = db.Column(db.String(64),unique = True)
email = db.Column(db.String(120),unique = True)
role = db.Column(db.SmallInteger,default = ROLE_USER)
posts = db.relationship('Post', (self):
返回True
def is_active(self):
def is_authenticated(self)返回True
$ b $ def is_anonymous(self):
return False
$ b def get_id(self):
return unicode(self.id)
def __repr __(self):
return'< User%r>'%(self.nickname)
is_authenticated,is_active和is_anonymous对我来说似乎很奇怪 - 他们什么时候会返回除了它们的pr之外的任何东西edefined的值?
有人可以向我解释为什么Flask-Login让我使用这些看似无用的方法吗? 首先, is_anonymous()
和 is_authenticated()
是彼此相反的。你可以定义一个作为另一个的否定,如果你想。
你可以使用这两个方法来确定用户是否登录。
当没有人登录时,Flask-Login的 current_user
被设置为 AnonymousUser
目的。此对象响应 is_authenticated()
和 is_active()
与 False
和 is_anonymous()
与 True 。
is_active()
方法有另一个重要用途。不像我在本教程中建议的那样总是返回 True
,您可以使禁用或停用的用户返回 False
这些用户将不被允许登录。
I'm working through the Flask Mega-Tutorial right now and I've come across this bit of code:
class User(db.Model):
id = db.Column(db.Integer, primary_key = True)
nickname = db.Column(db.String(64), unique = True)
email = db.Column(db.String(120), unique = True)
role = db.Column(db.SmallInteger, default = ROLE_USER)
posts = db.relationship('Post', backref = 'author', lazy = 'dynamic')
def is_authenticated(self):
return True
def is_active(self):
return True
def is_anonymous(self):
return False
def get_id(self):
return unicode(self.id)
def __repr__(self):
return '<User %r>' % (self.nickname)
is_authenticated, is_active, and is_anonymous seem quite strange to me - when would they ever return anything other than their predefined value?
Could somebody explain to me why Flask-Login makes me use these seemingly useless methods?
First of all, is_anonymous()
and is_authenticated()
are each other's inverse. You could define one as the negation of the other, if you want.
You can use these two methods to determine if a user is logged in.
When nobody is logged in Flask-Login's current_user
is set to an AnonymousUser
object. This object responds to is_authenticated()
and is_active()
with False
and to is_anonymous()
with True
.
The is_active()
method has another important use. Instead of always returning True
like I proposed in the tutorial, you can make it return False
for banned or deactivated users and those users will not be allowed to login.
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