Untitled

from flask import Flask
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()
app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///database.db'
db.init_app(app)


class Author(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    books = db.relationship('Book', backref='author', lazy=True)

    def __init__(self, name):
        self.name = name


class Book(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    title = db.Column(db.String(50))
    author_id = db.Column(db.Integer, db.ForeignKey('author.id'),
                          nullable=False)

    def __init__(self, title, author):
        self.title = title
        self.author = author


with app.app_context():
    db.create_all()
    # a1 = Author('Лев Николаевич Толстой')
    # a2 = Author(u'Александр Сергеевич Пушкин')

    a1 = Author.query.filter_by(name='Лев Николаевич Толстой').first()
    for book in a1.books:
        print(book.title)

app.run()