Rails - Dec 2005 - metaprogramming in controller: accessing instance variables

Hi all,

I''m trying to move a bunch of methods out of a controller into a  
library that I can include and call a class method to have it  
dynamically add a bunch of methods to the controller.

The goal is to just add to each controller:
include UIEnhancements::SubList
sub_list ''Note'', ''incomplete''

and have the sub_list method create all the methods needed to support  
the sub_list ui..

Where I am running into trouble is that I want the meta-programmed  
functions to have access to the instance vars (ie: @somethingorother  
or @params) just like the hard coded ones I had in the controller to  
begin with..

I''ve tried accessing via: instance_eval, instance_variable_get,  
eval.. all no good.

I have a file called "sub_list_system.rb" in the lib dir:

module UIEnhancements
   module SubList

	  def self.included(mod)
	    mod.extend(ClassMethods)
	    class_eval { helper :SubList }
	  end
	
	  module ClassMethods
	    def sub_list( model = ''Note'', parent =
''incomplete'' )
	
	      define_method("update_or_create_#{model.downcase.pluralize}")
do
			#Some stuff
			eval( "@#{parent}" ) = ''test''	
	     end
	end
  end
end

Does anyone know how to deal with this?

Thanks in advance!

> eval( "@#{parent}" ) = ''test''	
That bit won''t work; eval doesn''t return a valid lvalue. You
can try
instance_variable_set("@#{parent}", ''test'') instead.

-Ben