From: Gavin Kistner <gavin@...>
Date: 2004-02-20T20:21:47+09:00
Subject: Can't case on class?

The code below produces the following output:

    Class is ValidForm::OptionSet.
    Is it OK? true
    What about this: false
    WTF?


  1 class ValidForm::Option
  2   def field_tohtml(indentLevel=0)
  3     puts "Class is #{@optionSet.class}."
  4     puts "Is it OK? #{@optionSet.class==ValidForm::OptionSet}"
  5     puts "What about this: #{@optionSet==ValidForm::OptionSet}"
  6     case @optionSet.class
  7       when ValidForm::OptionSet
  8         #....
  9
10       when ValidForm::CheckboxSet
11         #....
12
13       when ValidForm::RadioSet
14         #....
15
16       else
17         puts 'WTF?'
18     end
19   end
20 end


Thanks to memmove on #ruby-lang I found that if I change line #6 to:

    case @optionSet   #no .class here

then it works, but I don't understand why.

Can someone explain why the former doesn't work?
If this isn't an official bug, I call it a design flaw :)

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