Simple Flask APP with Dispatcher

app.py

import flask
from flask_login import LoginManager, UserMixin, login_user, logout_user
from flask_sqlalchemy import SQLAlchemy
from werkzeug.middleware.dispatcher import DispatcherMiddleware

settings = {
    "SECRET_KEY": "hesdfdsfklj;l",
    "SQLALCHEMY_DATABASE_URI": "sqlite:///db.sqlite3",
}

db = SQLAlchemy()
login_manager = LoginManager()


class User(UserMixin, db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(20), default="admin")


@login_manager.user_loader
def get_user(id):
    return User.query.get(id)


def index():
    return flask.render_template("page.html")


def login():
    user = User.query.first()
    login_user(user)
    return flask.redirect(flask.url_for("index"))


def logout():
    logout_user()
    return flask.redirect(flask.url_for("index"))


def create_app(name="default"):
    app = flask.Flask(__name__)
    app.config.from_mapping(settings, NAME=name)

    db.init_app(app)
    login_manager.init_app(app)

    app.add_url_rule("/login", "login", login)
    app.add_url_rule("/logout", "logout", logout)
    app.add_url_rule("/index", "index", index)

    @app.cli.command()
    def initdb():
        db.create_all()
        db.session.add(User())
        db.session.commit()

    return app


application = create_app()
application.wsgi_app = DispatcherMiddleware(
    application.wsgi_app, {"/foo": create_app("foo"), "/bar": create_app("bar")}
)


if __name__ == "__main__":
    application.run()