Question

我正在尝试按照Flask Mega Tutorial来学习烧瓶。在part 5中，login（）视图的编辑方式如下：

@app.route('/login', methods = ['GET', 'POST'])
@oid.loginhandler
def login():
    if g.user is not None and g.user.is_authenticated():
        return redirect(url_for('index'))
    form = LoginForm()
    if form.validate_on_submit():
        session['remember_me'] = form.remember_me.data
        return oid.try_login(form.openid.data, ask_for = ['nickname', 'email'])
    return render_template('login.html', 
        title = 'Sign In',
        form = form,
        providers = app.config['OPENID_PROVIDERS'])

然而，这会给我一个AttributeError，我将在下面粘贴StackTrace。它给出了一个错误，我完全从示例的来源粘贴了一块。我使用PeeWee而不是SQLAlchemy，但由于这段代码没有对DB做任何事情，我不知道为什么会有相关的。

有人知道我在这里做错了吗？

Traceback (most recent call last):
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask/app.py", line 1461, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/flask_openid.py", line 446, in decorated
    return f(*args, **kwargs)
  File "/Users/kramer65/dev/repos/microblog/app/views.py", line 31, in login
    if g.user is not None and g.user.is_authenticated():
  File "/Users/kramer65/dev/repos/microblog/flask/lib/python2.7/site-packages/werkzeug/local.py", line 338, in __getattr__
    return getattr(self._get_current_object(), name)
AttributeError: '_AppCtxGlobals' object has no attribute 'user'

Answer 1

同样的教程，稍微进一步解释了如何设置g.user：

g.user global

如果你正在注意，你会记得在登录视图功能中我们检查g.user以确定用户是否已经登录。为了实现这一点，我们将使用Flask的before_request事件。每次收到请求时，任何用before_request修饰的函数都将在视图函数之前运行。因此，这是设置g.user变量（文件app/views.py）的正确位置：
@app.before_request
def before_request():
    g.user = current_user
这就是全部。 current_user全局由Flask-Login设置，所以我们只需在g对象中放一个副本就可以更好地访问它。这样，所有请求都可以访问登录用户内部模板。

您的代码显然缺少此before_request处理程序。

AttributeError：'_ AppCtxGlobals'对象在Flask中没有属性'user'

1 个答案:

g.user global