Todays' release of Ruby Science includes two new chapters. If you're already reading Ruby Science, make sure to log into GitHub and download the latest version.
In this week's updates, we cover composition and inheritance. You'll learn about the uses and drawbacks of Single Table Inheritance (STI), as well as how to convert an STI hierarchy to use composition through polymorphic associations.
The book is a work in progress, and currently contains around 104 pages of content. A $49 purchase gets you access to the current release of the book, all future updates, and the companion example application. In addition, purchasers have the ability to send thoughtbot their toughest Ruby, Rails, and refactoring questions.