OK, firstly I'm not sure you want to be using your contactrelation table both as a "secondary" as well as a mapped class. You generally want one or the other. See the note at the bottom of the "Association Object" section of http://docs.sqlalchemy.org/en/rel_0_9/orm/relationships.html#association-object
For your specific error, you could try defining the primaryjoin and secondaryjoin conditions like this, but I've honestly no idea if it is the right approach: primaryjoin=id=='foreign(contactrelation.c.from_contact_id)', secondaryjoin=id=='foreign(contactrelation.c.to_contact_id)', This definitely seems fishy to me though - I'm not sure if SA will understand that the 2 "id" columns there correspond to 2 different instances of the Contact class. Unless you have a particular need for the "secondary" mechanism, I would rewrite it so that ContactRelation has "from_contact" and "to_contact" relationships, then use an association proxy to hide the ContactRelation when you don't need it explicitly: http://docs.sqlalchemy.org/en/rel_0_9/orm/extensions/associationproxy.html Hope that helps, Simon On Wed, Sep 24, 2014 at 2:15 PM, Mohammad Reza Kamalifard <mr.kamalif...@gmail.com> wrote: > Here is the whole Contact and ContactRelation 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) > 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 = db.relationship('Contact', > secondary='contactrelation', > primaryjoin=id== 'contactrelation.c.from_contact_id', > secondaryjoin=id== 'contactrelation.c.to_contact_id', > backref = 'from_contacts') > > 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) > > > Thanks, > > Mohammad Reza > > > On Wed, Sep 24, 2014 at 2:38 PM, Simon King <si...@simonking.org.uk> wrote: >> >> Could you show the whole model and table definition? I've lost track >> of exactly what you've written. >> >> Thanks, >> >> Simon >> >> On Wed, Sep 24, 2014 at 11:15 AM, Mohammad Reza Kamalifard >> <mr.kamalif...@gmail.com> wrote: >> > thanks Mike >> > with new to_contacts relationship i have new error >> > ArgumentError: Could not locate any relevant foreign key columns for >> > primary >> > join condition 'contact.id = :param_1' on relationship >> > Contact.to_contacts. >> > Ensure that referencing columns are associated with a ForeignKey or >> > ForeignKeyConstraint, or are annotated in the join condition with the >> > foreign() annotation. >> > >> > On Wed, Sep 24, 2014 at 5:49 AM, Michael Bayer >> > <mike...@zzzcomputing.com> >> > wrote: >> >> >> >> to_contacts = db.relationship('Contact', >> >> secondary='contactrelation', >> >> primaryjoin='id== ContactRelation.from_contact_id', >> >> secondaryjoin='id== ContactRelation.to_contact_id', >> >> >> >> or >> >> >> >> to_contacts = db.relationship('Contact', >> >> secondary=contactrelation, >> >> primaryjoin=id== contactrelation.c.from_contact_id, >> >> secondaryjoin=id== contactrelation.c.to_contact_id, >> >> >> >> see examples: >> >> >> >> >> >> >> >> http://docs.sqlalchemy.org/en/rel_0_9/orm/relationships.html#self-referential-many-to-many-relationship >> >> >> >> >> >> >> >> >> >> On Sep 23, 2014, at 5:26 PM, Mohammad Reza Kamalifard >> >> <mr.kamalif...@gmail.com> wrote: >> >> >> >> Using contactrelation.from_contact_id ? >> >> I have AttributeError: 'Table' object has no attribute >> >> 'from_contact_id' >> >> Error. >> >> >> >> On Tue, Sep 23, 2014 at 4:48 PM, Michael Bayer >> >> <mike...@zzzcomputing.com> >> >> wrote: >> >> > >> >> > table name, not class name, please see >> >> > >> >> > http://docs.sqlalchemy.org/en/rel_0_9/orm/extensions/declarative.html#declarative-many-to-many >> >> > >> >> > >> >> > On Sep 23, 2014, at 8:33 AM, Mohammad Reza Kamalifard >> >> > <mr.kamalif...@gmail.com> wrote: >> >> > >> >> > 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' >> >> > >> >> > >> >> > >> >> > >> >> > -- >> >> > You received this message because you are subscribed to the Google >> >> > Groups "sqlalchemy" group. >> >> > To unsubscribe from this group and stop receiving emails from it, >> >> > send >> >> > an email to sqlalchemy+unsubscr...@googlegroups.com. >> >> > To post to this group, send email to sqlalchemy@googlegroups.com. >> >> > Visit this group at http://groups.google.com/group/sqlalchemy. >> >> > For more options, visit https://groups.google.com/d/optout. >> >> > >> >> > >> >> > -- >> >> > You received this message because you are subscribed to a topic in >> >> > the >> >> > Google Groups "sqlalchemy" group. >> >> > To unsubscribe from this topic, visit >> >> > 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