我目前正在开发一个 Flask 应用程序，之前在另一个应用程序中使用的身份验证代码出现了问题。该代码在

我目前正在开发一个 Flask 应用程序，我遇到了之前在另一个应用程序中使用的身份验证代码的问题。该代码在原始项目中运行正常，但当我将其复制到新项目时，我遇到了一个错误，指出它无法在数据库中找到用户名，即使它确实存在。python 3.12如何修复它？app.py

from flask import Flask
from flask_bcrypt import Bcrypt
from flask_login import LoginManager
from flask_migrate import Migrate
from config import Config
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()
bcrypt = Bcrypt()

login_manager = LoginManager()
login_manager.login_view = 'auth.login'  # Указываем представление для входа
login_manager.login_message = 'Please log in to access this page.'

migrate = Migrate()


def create_app(config_class=Config):
    app = Flask(__name__)
    app.config.from_object(config_class)

    db.init_app(app)
    bcrypt.init_app(app)
    login_manager.init_app(app)
    migrate.init_app(app, db)

    from models import User
    from routes import main_routes, user_routes, admin_routes, article_routes, meeting_routes, test_routes, \
        favorite_routes, bookmarks_routes,auth_routes

    app.register_blueprint(main_routes)
    app.register_blueprint(user_routes)
    app.register_blueprint(admin_routes)
    app.register_blueprint(article_routes)
    app.register_blueprint(meeting_routes)
    app.register_blueprint(test_routes)
    app.register_blueprint(favorite_routes)
    app.register_blueprint(bookmarks_routes)
    app.register_blueprint(auth_routes)

    @login_manager.user_loader
    def load_user(user_id):
        return User.query.get(int(user_id))
    
    return app

模型.py

class User(db.Model):
    __tablename__ = 'users'

    @property
    def is_active(self):
        # Assuming all users are active unless specified otherwise
        return True

    @property
    def is_authenticated(self):
        return True  # You might want to adjust this logic based on your session management

    @property
    def is_active(self):
        return True  # Already added, but ensure it's correct

    @property
    def is_anonymous(self):
        return False  # Typically false for authenticated users

    def get_id(self):
        return str(self.id)

    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(150), index=True, unique=True)  # Изменено на username
    email = db.Column(db.String(120), unique=True, nullable=False)
    password_hash = db.Column(db.String(128), nullable=False)
    role = db.Column(db.String(50), nullable=False, default='user')  # Новое поле для роли
    created_at = db.Column(db.DateTime, default=datetime.utcnow)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    articles = db.relationship('Article', backref='author', lazy=True)
    favorite_articles = db.relationship('Article', secondary='favorites', backref='favorited_by')
    bookmarked_articles = db.relationship('Article', secondary='bookmarks', backref='bookmarked_by')
    meetings = db.relationship('Meeting', backref='creator', lazy=True)

    def set_password(self, password_hash):
        self.password_hash = generate_password_hash(password_hash)

    def check_password(self, password_hash):
        return check_password_hash(self.password_hash, password_hash)

    def __repr__(self):
        return '<User {}>'.format(self.username)

验证码

@auth_routes.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('main.index'))
    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user and user.check_password(form.password.data):
            login_user(user, remember=True)
            next_page = request.args.get('next')
            return redirect(next_page or url_for('main.index'))
        else:
            flash('Invalid username or password')
    return render_template('login.html', title='Sign In', form=form)

以下是有关该情况的一些详细信息：

• 身份验证码与我之前项目中使用的相同。
• 两个项目中的库版本相同。
• 数据库连接正常运行。注册时正在创建记录，调试输出显示查询后所有用户的姓名。
• 该用户名存在于数据库中。