February 6th 2011 Assuming you are using factory girl!! In your db/seeds.rb file add require 'factory_girl' Dir[Rails.root.join("spec/factories/*.rb")].each {|f| require f} 10.times do Factory.create :user end This assumes a factory file spec/factories/*.rb Factory.sequence :email do |n| "somebody#{n}@example.com" end Factory.define :user do |f| f.email { Factory.next :email } f.password 'testing'