$ python from app import db db.create_all() exit()
max = Pet(name="max", age=10, owner_id=1) nil = Pet(name="Nil", age=5, owner_id=1) zus = Pet(name="Zus", age=3, owner_id=2)
db.session.add_all([max, nil, zus]) db.session.commit()
db.relationship and backref. mel = Pet(name="Mel", age=3, owner=b) db.session.add(mel) db.session.commit() mel.owner <Owner 2> mel.owner.name Karim mel.owner.address Nijkerk 36 PS