enumify

https://github.com/yonbergman/enumify

Enumify lets you add an enum command to ActiveRecord models There are four things that the enumify gems adds to your model Validation - The enumify adds a validation to make sure that the field only receives accepted values Super Cool Methods - adds ? and ! functions for each enum value (canceled? - is it canceled, canceled! - change the state to canceled) Callback support - you can add a x_callback method which will be called each time the status changes Scopes - you can easily query for values of the enum