python - flask-login:Exception: 没有为此 LoginManager 安装 user_loader。用 'LoginManager.user_loader' 装饰器添加一个

Question

我想使用 flask_login 来管理用户登录，但出现如下错误:

异常:没有为此 LoginManager 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

这是我的 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')

还有一张我试过的照片

Answer 1

你可以放置这个方法

@login_manager.user_loader
def load_user(user_id):
    return None

在 login_manager.init_app(app) 之后