SQLAlchemy multiple foreign keys in one mapped class to the same primary key

Question

Am trying to setup a postgresql table that has two foreign keys that point to the same primary key in another table.

When I run the script I get the error

Answer 1

The latest documentation:

• http://docs.sqlalchemy.org/en/latest/orm/join_conditions.html#handling-multiple-join-paths

The form of foreign_keys= in the documentation produces a NameError, not sure how it is expected to work when the class hasn't been created yet. With some hacking I was able to succeed with this:

company_id = Column(Integer, ForeignKey('company.id'), nullable=False)
company = relationship("Company", foreign_keys='Stakeholder.company_id')

stakeholder_id = Column(Integer, ForeignKey('company.id'), nullable=False)
stakeholder = relationship("Company",
                            foreign_keys='Stakeholder.stakeholder_id')

In other words:

… foreign_keys='CurrentClass.thing_id')