From: Demonic Software <demonic.software@...>
Date: 2008-03-14T12:39:52+09:00
Subject: Re: Naming ruby class attribute and methods

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Thanks David.
Is there any way to get the methods on an object that is already
instantiated?

Thanks again

On Thu, Mar 13, 2008 at 10:27 PM, David A. Black <dblack@rubypal.com> wrote:

> Hi --
>
> On Fri, 14 Mar 2008, Demonic Software wrote:
>
> > Hello,
> >
> > Is there a way to name all the methods and attributes/ class
> instantiated
> > variables that have been created?  For example, from the class below, I
> > would like to get all the variables instantiated from the initialize and
> > example methods, and then I would also like to be able to get the method
> > names.
> >
> >
> > #pseudo code, not sure if it really runs
> > class Foo
> >  def initialize()
> >     @thestring = ''
> >     @haha = "HA HA HAA!"
> >     @var = "I am a variable"
> >  end
> >  def example(arg)
> >     @arg = arg
> >     @thestring = "#{@haha} #{@var}: #{arg}"
> >  end
> >  def thestring
> >     @thestring
> >  end
> > end
> >
> >
> > So is there a way to extract ["thestring", "var", "haha", "arg"] for the
> > variable names and then  ["initialize", "example", "thestring"] for the
> > method names.  I can see how I would do it with regular expressions and
> > ruby2ruby, but I was wondering if there was another way of extracting
> the
> > information.  Thanks in advance.
>
> You can get method and instance variable names. An "attribute" is
> really a kind of virtual construct, composed of methods and (usually)
> instance variables, so it doesn't appear as a separate thing when you
> do introspective stuff on the object. The main time "attribute" exists
> is when you create them; after that, they're just methods (though one
> is of course free to continue to call them attributes).
>
> Foo.instance_methods(false) will give you all the instance methods
> defined in Foo. (The rather cryptic "false" means: don't include
> methods created higher in the ancestry.) To get the instance variables
> you have to instantiate the class, run the methods that create them,
> and then call the #instance_variables method. (Just defining methods
> with i. vars inside them doesn't create the i. vars.)
>
>
> David
>
> --
> Upcoming Rails training from David A. Black and Ruby Power and Light:
>   ADVANCING WITH RAILS, April 14-17 2008, New York City
>   CORE RAILS, June 24-27 2008, London (Skills Matter)
> See http://www.rubypal.com for details. Berlin dates coming soon!
>
>

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