Hi,

In message "[ruby-talk:15828] subclassing Date"
    on 01/05/28, Michael Husmann <Michael.Husmann / teleatlas.com> 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.