Hobo example

gistfile1.rb

class User < ActiveRecord::Base
  fields do
    first_name       :string, :ruby_default => 'First'
    last_name        :string  :ruby_default => 'Last',  :null => false, :default => ''
    name_addr        :string, :ruby_default => lambda { "#{full_name} <#{email}>" }
    email            :string  :ruby_default => lambda { organization.default_email }
    level            :enum,   :limit => [:Basic, :Admin, :Super], :default => :Basic, :null => false
  end

  def full_name
    [first_name, middle_name, last_name].select { |name| !name.blank? } * ' '
  end

  belongs_to :organization
end