our user.rb with Hobo Fields

user.rb

class User < ApplicationModel
  fields :null=>false do
    first_name :string
    last_name :string
    time_zone :string
    encrypted_password :binary, :limit => 255
    last_login_at :datetime, :null=>true
    tos_agreed_date :datetime, :null=>true
    registered_IP_address :string, :null=>true
    contact_country_code :string, :limit => 3, :default => ""
    contact_national_number :string, :limit => 12, :default => ""
    optimistic_lock
    timestamps
  end

  belongs_to :organization # implicitly indexes foreign key

  index [:contact_country_code, :contact_national_number]

  ...
end