Advanced Active Record

Now that you know how to avoid trouble with Active Record, it is time to take the next step. There are some more advanced database concepts that Rails developers should know (or at least be aware of) to, even more, improve the performance of the application and make its features more robust.This article is an introduction to those concepts, so I will only barely touch the surface, and each topic deserves a separate article with a deeper dive into the code.I tested all the presented examples against the PostgreSQL database, and not all concepts may be available on other database engines, or their implementations may vary.