Question

我是python编码的新手，但是直接开始尝试使用烧瓶。我在使用flask-login扩展时遇到问题我在这里制作一个简单的应用程序，这是一个博客。此博客仅供一个人使用。

我无法理解为什么user_loader装饰器不能在models.py中定义。我得到异常应用程序NoneType对象不可调用。我的app结构就像这样

.
|-- app
|   |-- admin
|   |   |-- __init__.py
|   |   |-- static
|   |   |-- templates
|   |   `-- views.py
|   |-- config.py
|   |-- __init__.py
|   |-- main
|   |   |-- __init__.py
|   |   |-- static
|   |   |-- templates
|   |   `-- views.py
|   `-- models.py
`-- launch.py

应用程序。的初始化

from flask import Flask
from main import main
from admin import admin
from flask.ext.script import Manager
from .config import config
from flask_debugtoolbar import DebugToolbarExtension
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy import Column
from flask_bootstrap import Bootstrap
from flask.ext.moment import Moment
from flask.ext.login import LoginManager


app_myblog=Flask(__name__)
app_myblog.debug=True
app_myblog.config.from_object(config)
app_myblog.register_blueprint(main)
app_myblog.register_blueprint(admin,url_prefix="/admin"
toolbar=DebugToolbarExtension(app_myblog)
manager=Manager(app_myblog)
db=SQLAlchemy(app_myblog)
Bootstrap(app_myblog)
moment=Moment(app_myblog)

login_manager=LoginManager()
login_manager.init_app(app_myblog)
login_manager.session_protection='strong'
login_manager.login_view='admin.login'

在app.models中，我定义了User类，它不会从数据库加载用户。实际上，它只是从配置中加载用户。在同一个文件中，我还定义了user_loader回调

class User(UserMixin):
    def __init__(self):
        self.id='1'
        self.name=app_myblog.config['USERNAME']
        self.password=app_myblog.config['PASSWORD']

    def get_id(self):
        return unicode(id)

@login_manager.user_loader
def load_user(userid):
    u=User()
    if u.get_id()==userid:
        return u
    else:
        return None

管理员。的初始化

from flask import Blueprint

admin=Blueprint('admin',__name__,template_folder='templates',static_folder='static')
from . import views

admin.views

from flask import render_template,request,redirect,url_for
from . import admin
from flask.ext.login import login_required,login_user
from flask_wtf.form import Form
from wtforms import StringField,PasswordField,SubmitField
from ..models import User



class LoginForm(Form):
    username=StringField('Username')
    password=PasswordField('Password')
    submit=SubmitField('Login')


@admin.route('/')
@login_required
def index():
    return render_template('admin_home.html')


@admin.route('/login',methods=['GET','POST'])
def login():
    form=LoginForm()
    if form.validate_on_submit():
        login_user(User())
        nextx = request.args.get('next')
        return redirect(nextx or url_for('admin.index'))
    return render_template('admin_login.html',form=form)

每当我运行具有login_required的路由时，我都会收到错误 TypeError：＆＃39; NoneType＆＃39;对象不可调用。这是追溯。

Traceback (most recent call last):
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1836, in __call__
    return self.wsgi_app(environ, start_response)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1820, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1403, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1817, in wsgi_app
    response = self.full_dispatch_request()
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1477, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1381, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask/app.py", line 1475, in full_dispatch_request
    rv = self.dispatch_request()
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_debugtoolbar/__init__.py", line 125, in dispatch_request
    return view_func(**req.view_args)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_login.py", line 756, in decorated_view
    elif not current_user.is_authenticated():
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/werkzeug/local.py", line 338, in __getattr__
    return getattr(self._get_current_object(), name)
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/werkzeug/local.py", line 297, in _get_current_object
    return self.__local()
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_login.py", line 46, in <lambda>
    current_user = LocalProxy(lambda: _get_user())
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_login.py", line 794, in _get_user
    current_app.login_manager._load_user()
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_login.py", line 363, in _load_user
    return self.reload_user()
  File "/home/shivam/Workspaces/PythonWorkSpace/MyBlog/venv/lib/python2.7/site-packages/flask_login.py", line 325, in reload_user
    user = self.user_callback(user_id)
TypeError: 'NoneType' object is not callable

Answer 1

编辑：我创建了一个代码的最小示例，区别在于我删除了get_id(self)函数（+一些不需要的额外库），因为它是{{1}的一部分你继承的类。

您确定自己的表单已经过验证吗？你能描述一下你如何逐步测试吗？我的意思是，＆＃34;转到login.html＆＃34; - ＆GT; ＆＃34;输入凭据＆＃34; - ＆GT;等

确定哪个呼叫导致崩溃，是否是登录功能中的UserMixin？

Answer 2

您应该在实例化登录管理器的同一位置定义方法。

ala

login = LoginManager
@login.user_loader
def load_user(id/email):
    #your logic here

或者从模块中导入loginmanager实例并在视图中定义。

Flask-Login：应该定义user_loader回调的位置？

2 个答案: