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app.py

from flask_sqlalchemy import SQLAlchemy
from flask import Flask, jsonify

db = SQLAlchemy()

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

    def add(self):
        db.session.add(self)

    @staticmethod
    def save():
        db.session.commit()


app = Flask(__name__)

app.config.from_mapping(
    SECRET_KEY='SHH',
    SQLALCHEMY_DATABASE_URI="sqlite://", # in memory
    SQLALCHEMY_TRACK_MODIFICATIONS=False,
)

db.init_app(app)

@app.before_first_request
def create_db():
    db.create_all()


@app.route('/')
def home():
    alice = User(name="alice")
    alice.add()
    alice.save()
    return 'User Added...'


@app.route('/users')
def users():
    all_users = [x.name for x in User.query.all()]
    return jsonify(users=all_users)


if __name__ == '__main__':
    app.run(debug=True)