sqlalchemy multiple foreign keys to same table

Question

I have a postgres database that looks something like this:

      Table \"public.entities\"
    Column     |            Type             |                   M         


        

Answer 1

It's not completely clear what exactly is causing the problem since you omitted the most important part -- code that throws that exception but if adding relationship properties to class PostModel throws that try to add foreign_keys parameter to relationship call as the following:

class PostModel(...):
    # ...
    subject1_id = Column(db.Column(db.BigInteger, db.ForeignKey(EntitiesModel.id), nullable=False)
    subject2_id = Column(db.Column(db.BigInteger, db.ForeignKey(EntitiesModel.id), nullable=False)
    subject1 = relationship(EntitiesModel, foreign_keys=subject1_id)
    subject2 = relationship(EntitiesModel, foreign_keys=subject2_id)