In my application with SQLAlchemy i need to create many to many
relationship between two contact object also sotre data for each of
relatioship 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.from_contact_id',
secondaryjoin='id==
ContactRelation.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)
every thing seems good but i have error :
AttributeError: type object 'ContactRelation' has no attribute 'c'
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