flask - Self-Referential Association Relationship SQLalchemy

Question

In my flask application with flask-sqlalchemy i need to create association between two contact here is my Contact model

class Contact(db.Model):
    __tablename__ = 'contact'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.Unicode(120), nullable=False, unique=False)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))

    to_contacts = db.relationship('Contact',
                                  secondary='ContactRelation',
                                  primaryjoin='id==contactrelation.c.from_contact_id',
                                  secondaryjoin='id==contactrelation.c.to_contact_id',
                                  backref='from_contacts')

and my association class ContactRelation:

class ContactRelation(db.Model):
    __tablename__ = 'contactrelation'
    id = db.Column(db.Integer, primary_key=True)
    from_contact_id = db.Column(db.Integer, db.ForeignKey('contact.id'))
    to_contact_id = db.Column(db.Integer, db.ForeignKey('contact.id'))
    relation_type = db.Column(db.String(100), nullable=True)

i have error :

AttributeError: type object 'ContactRelation' has no attribute 'c'

Answer 1

Thanks to Michel and Simon on SQLAlchemy mailing list i need association_proxy and two relation to Contact relation.

class Contact(db.Model):
    __tablename__ = 'contact'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.Unicode(120), nullable=False, unique=False)
    created_on = db.Column(db.DateTime, default=datetime.utcnow)
    birthday = db.Column(db.DateTime)
    background = db.Column(db.Text)
    photo = db.Column(db.Unicode(120))
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'))

    to_contacts = association_proxy('to_relations', 'to_contact')
    from_contacts = association_proxy('from_relations', 'from_contact')

class ContactRelation(db.Model):
    __tablename__ = 'contactrelation'
    id = db.Column(db.Integer, primary_key=True)
    from_contact_id = db.Column(db.Integer, db.ForeignKey('contact.id'))
    to_contact_id = db.Column(db.Integer, db.ForeignKey('contact.id'))
    relation_type = db.Column(db.String(100), nullable=True)

    from_contact = db.relationship(Contact,
                                   primaryjoin=(from_contact_id == Contact.id),
                                   backref='to_relations')
    to_contact = db.relationship(Contact,
                                 primaryjoin=(to_contact_id == Contact.id),
                                 backref='from_relations')