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):         


        

Answer 1

it seems that if you change the to_contacts to something like below, your problem will be solved:

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