require "active_record" require "logger" class OtherDB < ActiveRecord::Base self.abstract_class = true end class Book < ActiveRecord::Base validates :field, { presence: true } end class Book2 < OtherDB self.table_name = :books validates :field, { presence: true } end ActiveRecord::Base.logger = Logger.new(STDOUT) ActiveRecord::Base.establish_connection( adapter: 'mysql2', host:'localhost', usernam