[Python知识库]Flask_login missing user_loader error exception in flask app解决方案

将models.py下的回调函数@login_manager.user_loader移动到app/init.py的create_app()中去。
如下示例：

from flask import Flask, render_template
from flask_bootstrap import Bootstrap
from flask_mail import Mail
from flask_moment import Moment
from flask_sqlalchemy import SQLAlchemy
from flask_login import LoginManager, login_required
from config import config

bootstrap = Bootstrap()
mail = Mail()
moment = Moment()
db = SQLAlchemy()

# 登录拓展
login_manager = LoginManager()
login_manager.session_protection = 'strong'
login_manager.login_view = 'auth.login'

def create_app(config_name):
    # 配置加载
    app = Flask('Hermes')
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    # 拓展模块
    bootstrap.init_app(app)
    mail.init_app(app)
    moment.init_app(app)
    db.init_app(app)
    login_manager.init_app(app)

    # 添加蓝本路由
    from main import main as main_blueprint
    app.register_blueprint(main_blueprint)

    from auth import auth as auth_blueprint
    app.register_blueprint(auth_blueprint, url_prefix='/auth')

    @login_manager.user_loader
    def load_user(user_id):
        from .models import User
        return User.query.get(user_id)

    return app