What are SQLAlchemy relationships and how do I use them?

What are SQLAlchemy relationships and how do I use them?

SQLAlchemy relationships allow you to define how different tables in your database are related to each other. You can use relationships to easily navigate between related objects.

Can you give me an example of a one-to-many relationship?

Sure! In a one-to-many relationship, one record in a parent table can be associated with multiple records in a child table. For example, a User can have many Posts. You would define this in SQLAlchemy using the relationship() function.

How do I set up a many-to-many relationship?

To set up a many-to-many relationship, you need an association table that links the two tables. For instance, if you have Students and Courses, you would create an enrollment table that references both.

What are the common pitfalls when using relationships in SQLAlchemy?

Common pitfalls include not properly defining the backref, forgetting to set the cascade option, and not handling session management correctly.