mnesia-transform.ex

gistfile1.ex

iex(15)> trans = fn(backup) ->                                                       
...(15)> IO.puts "backup: #{inspect backup}"                                         
...(15)> backup
...(15)> end
#Function<6.50752066/1 in :erl_eval.expr/5>
iex(16)> :mnesia.transform_table(:endpoints, trans, [:idx, :host, :port, :transport])
backup: {:endpoint, 1, 'localhost', 5555, 'tcp'}
{:atomic, :ok}
iex(17)> :mnesia.transform_table(:endpoints, trans, [:idx, :host, :port, :transport])
backup: {:endpoint, 1, 'localhost', 5555, 'tcp'}
{:atomic, :ok}