About FriendlyId FriendlyId is an add-on to Ruby's Active Record that allows you to replace ids in your URLs with strings: # without FriendlyId http://example.com/states/4323454 # with FriendlyId http://example.com/states/washington It requires few changes to your application code and offers flexibility, performance and a well-documented codebase. Core Concepts Slugs The concept of slugs is at the