db.relationship sqlalchemy flask
class Person(db.Model):
id = db.Column(db.Integer, primary_key=True)
name = db.Column(db.String(50), nullable=False)
addresses = db.relationship('Address', backref='person', lazy=True)
class Address(db.Model):
id = db.Column(db.Integer, primary_key=True)
email = db.Column(db.String(120), nullable=False)
person_id = db.Column(db.Integer, db.ForeignKey('person.id'),
nullable=False)many to many flask-sqlalchemy
association_table = db.Table('association', db.Model.metadata,
db.Column('left_id', db.Integer, db.ForeignKey('left.id')),
db.Column('right_id', db.Integer, db.ForeignKey('right.id'))
)
class Parent(db.Model):
__tablename__ = 'left'
id = db.Column(db.Integer, primary_key=True)
children = db.relationship("Child",
secondary=association_table)
class Child(db.Model):
__tablename__ = 'right'
id = db.Column(db.Integer, primary_key=True)
p = Parent()
c = Child()
p.children.append(c)
db.session.add(p)
db.session.commit()Copyright © 2021 Codeinu
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