What is wrong with my relationships in SQL Alchemy?

Question

I am using SQLAlchemy with Flask to create relationships for my application. I recently rewrote the relationships, and, no matter what I change, I keep getting the error:

Answer 1

Try to use primaryjoin in your CurriculumVersion class as follows:

Change

enrollments = db.relationship('Enrollment', backref='enrollment', lazy='dynamic')

to

enrollments = db.relationship('Enrollment', backref='enrollment', lazy='dynamic', primaryjoin="Enrollment.version_id==CurriculumVersion.id")

Note: You might need to do this for the other classes as well.