How do I manage relationships in Flask?

How do I manage relationships in Flask?

In Flask, you can manage relationships using SQLAlchemy. Are you looking for one-to-many or many-to-many relationships?

I'm interested in one-to-many relationships. Can you explain how to set that up?

Sure! In a one-to-many relationship, you typically have a parent model and a child model. For example, a User can have many Posts. You would define it like this in your models.

Can you show me a code example for that?

Absolutely! Here's a simple example:

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    posts = db.relationship('Post', backref='author', lazy=True)

class Post(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('user.id'), nullable=False)