Python: AttributeError：'RequestContext‘对象没有’RequestContext‘属性(当分配给session[’username‘]时)

Question

我正在尝试在烧瓶中设置session['username']属性。我用的是蓝图。我的目录结构如下(截断了一些不相关的子目录)：

├───app
│   ├───forum
│   │   ├───static
│   │   └───templates
│   ├───googleutils
│   ├───home
│   ├───login
│   ├───profile
│   ├───register
│   ├───static
│   └───templates
└───env

我在虚拟环境中工作。

在app目录中，我有一个__init__.py，它包含以下内容：

from flask import Flask

def create_app():
    app = Flask(__name__, instance_relative_config=False)
    app.secret_key = 'who_cares_about_security' # ignore bad secret, placeholder

    with app.app_context():
        # Register blueprints here, truncated for clarity

        from .login import login
        app.register_blueprint(login.login_bp)

        return app

在登录目录中，我有一个login.py

from flask import Blueprint, render_template, request, session, redirect, url_for
import app.googleutils.utils as googleutil

login_bp = Blueprint(
    'login_bp', __name__,
    template_folder='templates',
    static_folder='static'
)


@login_bp.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == "POST":
        # process login request
        username = request.form["username"]
        password = request.form["password"]
        user = googleutil.find_user(username, password)

        if user:
            session["username"] = username
            return redirect(url_for('home_bp.home'))

        return render_template('login.html') #placeholder
    else:
        return render_template('login.html')

当用户访问/login时，他们填写用户名/密码表，我通过POST获取该表单。这将根据存储在上的实体列表进行检查。如果找到用户名/密码匹配，则尝试将session['username']属性分配给用户名。但是，这给了我一个错误：AttributeError: 'RequestContext' object has no attribute 'login'。

这是堆栈跟踪：

Traceback (most recent call last):
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 2464, in __call__
    return self.wsgi_app(environ, start_response)
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 2450, in wsgi_app
    response = self.handle_exception(e)
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 1867, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 2447, in wsgi_app
    response = self.full_dispatch_request()
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\_compat.py", line 39, in reraise
    raise value
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
    rv = self.dispatch_request()
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\app.py", line 1936, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "C:\Users\NAME\Desktop\PROJECT\env\login\login.py", line 20, in login
    session["username"] = username
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\werkzeug\local.py", line 350, in __setitem__
    self._get_current_object()[key] = value
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\werkzeug\local.py", line 306, in _get_current_object
    return self.__local()
  File "C:\Users\NAME\Desktop\PROJECT\env\Lib\site-packages\flask\globals.py", line 39, in _lookup_req_object
    return getattr(top, name)
AttributeError: 'RequestContext' object has no attribute 'login'

我不知道我做错了什么。在烧瓶的globals.py中，我发现这些行提到了"login“属性：

# context locals
_request_ctx_stack = LocalStack()
_app_ctx_stack = LocalStack()
current_app = LocalProxy(_find_app)
request = LocalProxy(partial(_lookup_req_object, "request"))
session = LocalProxy(partial(_lookup_req_object, "login"))
g = LocalProxy(partial(_lookup_app_object, "g"))

但我不知道从这里该怎么办。

取消注释行session["username"] = username修复了错误，并且RHS变量username绝对不是空的。

谢谢。

Answer 1

烧瓶的globals.py应该是这样的：

session = LocalProxy(partial(_lookup_req_object, "session"))

根据烧瓶源代码。这一行从来没有使用字符串“登录”，在烧瓶的历史。我不知道为什么您的系统会这样，但是将其更改为"session“应该可以解决您的问题。