From: Dave Grijalva <grijalva@...>
Date: 2007-05-30T06:57:50+09:00
Subject: Re: Overriding to_s

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the result of foo.class is not of type String, but of type Class.  when you
say puts foo.to_s, the puts method is calling to_s on the class that you've
returned from calling to_s.  To get the expected result, define to_s like
this:

  def to_s
    self.class.to_s
  end

OR

  def to_s
    "#{self.class}"  #this is not as efficient, but you're guaranteed to get
a String result
  end

-dave

On 5/29/07, kimersen@gmail.com <kimersen@gmail.com> wrote:
>
> On May 29, 12:15 pm, Rohan Dey <rohan...@gmail.com> wrote:
> > unknown wrote:
> > > Hi,
> >
> > > I'm playing around with ruby trying to understand whats going on, and
> > > here is something I don't understand.
> >
> > > class ZNum
> > >   def initialize(n)
> > >     @n=n
> > >   end
> > >   def to_s
> > >     self.class
> > >   end
> > > end
> >
> > > n = ZNum.new(1234)
> >
> > > puts n            # prints #<ZNum:0xb75dfcc8>
> > > puts n.to_s     # prints ZNum
> >
> > > In both cases it uses ZNum#to_s, but the results are different. Why?
> >
> > > /kim
> >
> > Not able to understand what you are actually asking. Can you put little
> > detail on this.
> >
> > --
> > Posted viahttp://www.ruby-forum.com/.
>
> I'm working on an interface for some legacy data.
> The legacy data will be stored in objects as ruby numbers (fixnum,
> bignum and float), but I need to override ruby's number formating. My
> example above has no practical value, it's just some odd behavior that
> I would like to understand before I design my legacy interface.
>
> /kim
>
>
>

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