From: "Jakub Pavlík jn." <severus@...>
Date: 2008-10-03T02:36:00+09:00
Subject: Re: Problem extending (adding methods) to class

Class defined inside a module behaves exactly the same as if she was defined
'outside' - it isn't 'static' in any way.

(Following notes may either help you or not - I haven't understood
totally where exactly your problem is.)

If you want to extend class ClassC defined inside module ModuleM , you can 
either write

module ModuleM
  class ClassC
    # add new methods here
  end
end

or

class ModuleM::ClassC
  # add new methods here
end

Similarly if you want to subclass ClassC, you can do it inside ModuleM

module ModuleM
  class ClassD < ClassC
    # blah blah
  end
end

or outside:

class ClassD < ModuleM::ClassC
  # blah blah
end

Sorry if I didn't understand you at all...

> Lex Williams wrote:
> > Nit Khair wrote:
> >> Nit Khair wrote:
> >>> I am trying to extend a class developed by someone else (its from the
> >>> ncurses-ruby lib). I need to add some fields and methods to it.
> >>> 
> >> 
> >> On further thought I am wondering if being inside a module makes that 
> >> class different. Like some sort of static or factory class. Nothing 
> >> coming up on google on "module classes" or classes within modules.
> >> 
> >> Could someone explain this or point me to a link. I read that modules 
> >> cannot be instantiated or subclasses - fine. What of classes declared in 
> >> them ?
> > 
> > why don't you take advantage of open classes ?
> > 
> > you can write this :
> > 
> > class MyClass
> >   attr_accessor :myfield
> > end
> > 
> > and then you can access myfield using any instance of that class . The 
> > same goes with methods .
> > 
> > If you write :
> > 
> > class MyClass
> >   def my_new_method
> >      #some logic here
> >   end
> > end
> > 
> > then , all your objects will have that method .
> 
> Are you by any chance saying the same thing i have done above, when i 
> copied the Module Class thing from the original source and added my 
> method and data to it ?
> 
> However, this much is working, but i need a heirarchy. I am unable to 
> extend this and add methods to it.
> 
> If the original class was declared as:
> 
> >Module MyClass
> > class MYCLASS
> >   attr_accessor :myfield
> > end
> >end
> 
> I can copy this, and add:
>    attr_accessor :newfield
> This is okay.
> 
> But when i do:
> 
> class AnotherClass < MYCLASS
>   attr_accessor :anotherfield
> end
> 
> then i get a NoMethodError pointing to MyClass::MYCLASS. I get no error 
> when instantiating AnotherClass, only when i access the method added.
> 
> I need a heirarchy of classes under Ncurses::FORM.
> 
> -- 
> Posted via http://www.ruby-forum.com/.

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