[ruby-talk:15848] Re: subclassing Date

Yukihiro Matsumoto wrote:

> Hi,
>
> In message "[ruby-talk:15828] subclassing Date"
>     on 01/05/28, Michael Husmann <[e-mail]> writes:
>
> |Using ruby 1.6.0 and trying to subclass the Date class like
> |this:
> |
> |class My_date < Date
> |    def initialize(st)
> |        l = split(".")
> |        y, m, d = l.collect{|s| s.to_i}
> |        super(y,m,d)
> |    end
> |end
> |
> |ruby throws the following error messages when invoking:
> |d = My_date.new("2001.5.28")
> |
> |/usr/local/lib/ruby/1.6/date.rb:33:in `civil_to_jd':
> |undefined method `-' for "2001.5.28":String (NameError)
> |/usr/local/lib/ruby/1.6/date.rb:139:in `exist3?'
> |/usr/local/lib/ruby/1.6/date.rb:147:in `new3'
>
> You're calling `super("2001.5.28",...)'.  I think there's something
> wrong before calling super.  Try:
>
>    class My_date < Date
>        def initialize(st)
>            l = st.split(".")    # note "st."
>            y, m, d = l.collect{|s| s.to_i}
>            super(y,m,d)
>        end
>    end
>
>                                                         matz.

Hi Matz,

yes I have forgotten the st before split. But the problem still exists
after changing the code

Michael

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Michael Husmann
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