# database.yml

development:
  adapter: mysql
  database: dev
  username: dbuser_dev
  password:
  host:

  server5:
    adapter: mysql
    database: dev
    username: dbuser_dev_read
    password:
    host:
    port: 3306

  server6:
    adapter: mysql
    database: dev
    username: dbuser_dev_read
    password:
    host:
    port: 3306

  server10:
    adapter: mysql
    database: dev
    username: dbuser_dev
    password:
    host:
    port: 3306

# environment.rb

class << ActiveRecord::Base
  def read_only_inherited(child)
    child.acts_as_readonlyable :server5, :server6, :server10
    ar_inherited(child)
  end

  alias_method :ar_inherited, :inherited
  alias_method :inherited, :read_only_inherited
end