FAQ: Introduction to Flask-SQLAlchemy - Part II: declaring relationships (Foreign keys)

This community-built FAQ covers the “Part II: declaring relationships (Foreign keys)” exercise from the lesson “Introduction to Flask-SQLAlchemy”.

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This exercise can be found in the following Codecademy content:

Build Python Web Apps with Flask

FAQs on the exercise Part II: declaring relationships (Foreign keys)

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in this lesson we wrote:

book_id = db.Column(db.Integer, db.ForeignKey('book.id'))


reviewer_id = db.Column(db.Integer, db.ForeignKey("reader.id"))

Why do we write “book” in “book.id” and “reader” in “reader.id” in lower cases?

Thank you!


I have the same question.

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Why its "reader.id" instead of "reviewer.id", when we set backref='reviewer' in the Reviewer class relationship declaration.

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