Sqlalchemy uselist. article)) Dec 3, 2024 · With this SQLAlchemy tutorial, you will learn to access and run SQL queries on all types of relational databases using Python objects. One-to-Many Relationships In one-to-many relationships, the foreign key exists on the "many" side, and the "one" side holds a collection. Nov 7, 2025 · Relationship Patterns SQLAlchemy supports three fundamental relationship patterns, each determined by the foreign key configuration and the uselist parameter. I can't seem to find any documentation about lists, and was wondering if this was May 7, 2021 · First, it looks like you are mis-using the uselist, which you most likely can already see as sqlalchemy most likely issues a warning Multiple rows returned with uselist=False for. The uselist flag indicates the placement of a scalar attribute instead of a collection on the many side of the relationship. uselist parameter of the relationship() construct, or in some cases the backref() construct, applying it on the “one-to-many” or “collection” side of a relationship. By adding uselist = False , you can ensure your one-to-one relationships behave as intended. Working with Large Collections ¶ The . uselist flag is also available on an existing relationship() construct as a read-only attribute, which can be used to determine if this relationship() deals with collections or scalar attributes: Introduction to SQLAlchemy 2 In Practice Posted by on under In 2023 I wrote "SQLAlchemy 2 In Practice", a book in which I offer an in-depth look at SQLAlchemy version 2, still the current version today. This section presents additional information about collection configuration and techniques. hswv yomet zrpt mvfd fwqugo zbgszos nsnquz fwupwj kblxne eyamn