Composite primary keys in Rails - Honeybadger Developer Blog

Primary keys are vital in the design of a relational database. They are crucial in uniquely identifying records.For example, if you have a table of users, you will need to identify each record uniquely. This is where primary keys are used. Primary keys are usually single columns that auto-increment. There might be cases where you'll need a combination of column to serve as the primary key - this is where composite primary keys become helpful. This article will explore composite primary keys, how they work in Rails, when they should be used, and what to consider when using them.