From: "Damián M. González" <lists@...>
Date: 2012-09-27T01:02:06+09:00
Subject: Subclassing Date

Ey guys, can't understand what's happening here:

 require 'date'

 class Dia < Date
  def initialize(ano, mes, dia, obj_mes)
   @mes = obj_mes
   super(ano, mes, dia)
  end
 end

 a = Dia.new
 => #<Dia: -4712-01-01 ((0j,0s,0n),+0s,2299161j)>
 #Was expecting an error, no arguments has been passed
 a = Dia.new(2012, 6, 21, "foo")
 => TypeError: no implicit conversion to float from string
        from (irb):31:in `new'
        from (irb):31
        from C:/Ruby193/bin/irb:12:in `<main>'
 #Seems that the 4th argument is taked by...super too?? WTF
 a = Dia.new(2012, 5, 26)
 => #<Dia: 2012-05-26 ((2456074j,0s,0n),+0s,2299161j)>
 a = Dia.new(2012, 5, 26, Date::ITALY)
 => #<Dia: 2012-05-26 ((2456074j,0s,0n),+0s,2299161j)>
 #Obvious is taked by super...but why? I don't expect that

 We can see that new() doesn't matter if it is no receive parameters, or
if it receive, it behave like make Date.new, but why? I'm re-defining
the method initialize in Dia, it sholud(am I wrong?) take exactly 4
parameters and asign the last one to the instance variable @mes. Why is
this happening? I've tried putting super in the first line of the
definition but the same's returned. Thanks for your time.

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