python – flask-login：异常：没有为此LoginManager安装user_loader.使用’LoginManager.user_loader’装饰器添加一个

我想使用flask_login来管理用户登录,但是有些错误如下：

例外：此LoginManager尚未安装user_loader.使用’LoginManager.user_loader’装饰器添加一个.

这是我的models.py(PS：我使用Flask peewee来构建我的模型)

from peewee import *
from playhouse.fields import ManyToManyField
from .__init__ import login_manager
from flask_login import UserMixin, AnonymousUserMixin

db = SqliteDatabase('adminSystem.db')

class BaseModel(Model):
    class Meta:
        database = db

class User(UserMixin, BaseModel):
    name = CharField()
    email = CharField()
    is_admin = BooleanField()
    username = CharField()
    passwd_hash = CharField()
    teacher = ForeignKeyField('self', related_name='students', null=True)

    #def is_authenticated(self):
    #    return True

    #def is_active(self):
    #    return True

    #def is_anonymous(self):
    #    return False

    #def get_id(self):
    #    try:
    #        return unicode(self.id)
    #   except NameError:
    #        return str(self.id)

class Homework(BaseModel):
    owner = ForeignKeyField(User, related_name='homeworks', null=True)
    pub_datetime = DateTimeField()
    connect = TextField()
    homework_id =CharField()
    file_url = CharField()

class Score(BaseModel):
    homework_id = CharField()
    stu_id = CharField()
    grade = IntegerField()
    file_url = CharField()

class AnonymousUser(AnonymousUserMixin):
    def can(self, permissions):
        return False

    def is_administrator(self):
        return False

@login_manager.user_loader
def load_user(userid):
    try:
        #: Flask Peewee used here to return the user object
        return User.get(User.id==userid)
    except User.DoesNotExist:
        return None

这是我view.py的一部分

from flask import render_template, url_for, redirect, request, g
from . import auth
from werkzeug.security import generate_password_hash, check_password_hash
from ..models import db, User, Homework, Score
from flask_login import login_user, logout_user, login_required, current_user

@auth.before_app_request
def before_request():
    g.user = current_user

@auth.route('/login', methods=['POST', 'GET'])
def login():
    if request.method == 'POST':
        if request.form['role'] == 'teacher':
            user = User.get(User.username == request.form['username'])
            if check_password_hash(user.passwd_hash, request.form['password']):
                login_user(user)
                return redirect(url_for('main.post'))
            return render_template('login.html')
        elif request.form['role'] == 'student':
            user = User.get(User.username == request.form['username'])
            if check_password_hash(user.passwd_hash, request.form['password']):
                login_user(user)
                return redirect(url_for('main.show'))
            return render_template('login.html')
    return render_template('login.html')

并且有一张我尝试过的照片

解决方法:

根据https://flask-login.readthedocs.io/en/latest/#configuring-your-application

Once the actual application object has been created, you can configure
it for login with:

login_manager.init_app(app)

之后,您可以使用装饰器等注册回调.以便login_manager具有要处理的上下文.

标签：python,flask,flask-login
来源： https://codeday.me/bug/20190724/1524313.html