From: "daniel åkerud" <daniel.akerud@...>
Date: 2007-10-29T17:43:28+09:00
Subject: uniq on custom objects

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I cannot get uniq to work with an array of custom class-objects. It seems
overriding hash is now enough. This is what I mean:

class Obj
  attr_reader :name, :number
  def initialize(name, number)
    @name = name
    @number = number
  end
  def hash
    return @name.hash
  end
end

a = [Obj.new("apa", 1), Obj.new("apa", 2), Obj.new("smisk", 3)]

=> [#<Obj:0x31baca8 @number=1, @name="apa">, #<Obj:0x31bac80 @number=2,
@name="apa">, #<Obj:0x31bac58 @number=3, @name="smisk">]

a.uniq

=> [#<Obj:0x31baca8 @number=1, @name="apa">, #<Obj:0x31bac80 @number=2,
@name="apa">, #<Obj:0x31bac58 @number=3, @name="smisk">]

But i want only one instance of "apa", and it doesn't matter which. Is there
something else I have to override?

/D

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