The Rails Way
Now, for the first time, there’s a comprehensive, authoritative guide to building production-quality software with Rails. Pioneering Rails developer Obie Fernandez and a team of experts illuminate the entire Rails API, along with the Ruby idioms, design approaches, libraries, and plug-ins that make Rails so valuable.
Add "rescue nil" to migration commands that you want the migration to try but don't care if it fails. Helpful for debugging migrations and helpful when you want to modify a previous migration, let's say add a column, and you don't want the remove column in the drop block to choke your reverse migration.