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The Wisdom of Quinn

Informative DevForum posts from everyone's favorite DTS member.

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id

F = fun(F, Fd) -> receive stop -> io:format(Fd, "stop~n", []), file:close(Fd), ok; Msg -> io:format(Fd, "~p~n", [Msg]), F(F, Fd) end end.
{ok, Fd} = file:open("/tmp/trace.out", [write]), Tracer = proc_lib:spawn(fun() -> F(F, Fd) end).

%% trace everything
erlang:trace(Pid, true, [all, {tracer, Tracer}]).
%% stop tracing
erlang:trace(Pid, false, [all, {tracer, Tracer}]).
Tracer ! stop.

%% match pattern

scaryguy

-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;

-- Then change column name of  your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;

gmanley

class MatchData

  def to_hash
    Hash[[names, captures].transpose]
  end
  alias :to_h :to_hash
end