dm-transactions-patch.rb

module DataMapper
  class Transaction
    def link_with_master_slave(*things)
      things = things.collect do |t|
        case t
        when DataMapper::Adapters::MasterSlaveAdapter
          t.master
        else
          t
        end
      end

      link_without_master_slave(*things)
    end
    alias_method_chain :link, :master_slave
  end
end