ORM saves SQL code and allows to retrieve any instance associations from models. (Polymorphic, Single Table Inherited, eager joins etc.) </li></ul>This association generate 2 level join from Users table
Instruments of Ruby on Rails <ul>Rails console <li>You can load all project environment and debug application in console </li></ul>
Instruments of Ruby on Rails <ul>Test driven and Behavior driven development <li>Rails was designed to build your application in test or behavior driven style.
You will always sure that you didn't break anything. And all features work as well.