How do I perform complex queries in SQLAlchemy for my Flask app?

How do I perform complex queries in SQLAlchemy for my Flask app?

You can use the session.query() method along with various filtering and joining techniques. What specific query are you trying to build?

I need to filter users based on their age and join with their orders.

You can do that using the filter() method and join(). For example:

from yourapp import db

results = db.session.query(User).join(Order).filter(User.age > 30).all()

This will give you all users older than 30 who have orders.

What if I want to sort the results by the order date?

You can add an order_by() clause to your query. For example:

results = db.session.query(User).join(Order).filter(User.age > 30).order_by(Order.date.desc()).all()

This will sort the results by the order date in descending order.