I am using an association model / table to represent a many to many relationship:
class Geography(db.Model): id = ... class Fund(db.Model): id = ... geography_associations = db.relationship( lambda: FundGeographyAssociation, back_populates="fund", cascade='save-update, merge, delete, delete-orphan' ) geographies = db.relationship( Geography, backref="fund", secondary=lambda: FundGeographyAssociation.__table__, ) class FundGeographyAssociation(db.Model): fund_id = db.Column( UUID, db.ForeignKey(Fund.id), primary_key=True, ) geography_id = db.Column( UUID, db.ForeignKey(Geography.id), primary_key=True, ) fund = db.relationship(Fund, back_populates='geography_associations') and then am attempting to update the list of geographies for a Fund using: fund.geographies = [????] my issue is what to put in ??? when I only have the pk of the geography model. this works: Geography.query.get(id) however this does not: Geography(id=id) as the latter tries to create a new Geography object leading to conflicts. The former seems "silly" as it requires an extra query to db to load the object even though all i need is the geography id to create the association object. I tried variation of session.merge with load=False however that doesn't work as the object is transient. -- SQLAlchemy - The Python SQL Toolkit and Object Relational Mapper http://www.sqlalchemy.org/ To post example code, please provide an MCVE: Minimal, Complete, and Verifiable Example. See http://stackoverflow.com/help/mcve for a full description. --- 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 https://groups.google.com/group/sqlalchemy. For more options, visit https://groups.google.com/d/optout.