UserGuest.blueprint do username password "12345" password_confirmation "12345" role email comments end ... and then in my blueprint.rb require 'machinist/active_record' require 'sham' require 'forgery' Sham.define do email { Forgery(:internet).email_address } username { Forgery(:internet).user_name } description { Forgery(:lorem_ipsum).paragraphs(2) } end