Ruoyi-Flask-admin/app/__init__.py

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 config import config
from flask_login import LoginManager

loginmanager = LoginManager()
loginmanager.session_protection = 'strong'
loginmanager.login_view = 'base.login'

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


def create_app(config_name):
    app = Flask(__name__)
    app.config.from_object(config[config_name])
    config[config_name].init_app(app)

    bootstrap.init_app(app)
    mail.init_app(app)
    moment.init_app(app)
    db.init_app(app)
    loginmanager.init_app(app)

    from .base import base as base_blueprint
    app.register_blueprint(base_blueprint)
    return app