Rails - Mar 2005 - Re: I have a dream for easier meta-programming

Thank you all for your responses, but I can see I didn''t make myself 
clear. I know that Ruby doesn’t work the way I want it to, and I know 
why it works the way it does. I am completely aware of the difference 
between a class and an object.

This is just a dream for how I wish Ruby did work, it would make some 
of the programming for the Rails framework much easier and elegant. 
Ulysses addressed my issue closest by talking about append_features.

I would also love to be able to do this in Ruby:

  class Test
      x = true
      if x
          def foo(bar)
              @wibble = bar
          end
      end
      
      for i in 1..10
          def ok(me)
              @hello[i] = me
          end
      end

    ok “you”
  end

-Lucas
http://rufy.com/

On Sun, 27 Mar 2005 12:13:15 -0800, Lucas Carlson
<lucas-1eRuzFDw/cg@public.gmane.org> wrote:
> This is just a dream for how I wish Ruby did work, it would make some
> of the programming for the Rails framework much easier and elegant.
> Ulysses addressed my issue closest by talking about append_features.
> 
> I would also love to be able to do this in Ruby:
> 
>   class Test
>       x = true
>       if x
>           def foo(bar)
>               @wibble = bar
>           end
>       end
Conditional definition of methods? Then if you call the method and
it''s not there, you get a NoMethodError. What is wrong with this? :

@allow_foo = true
def foo(bar)
  return nil if !@allow_foo
  @wibble = bar
end
>       for i in 1..10
>           def ok(me)
>               @hello[i] = me
>           end
>       end
> 
>     ok "you"
>   end
This part doesn''t even make sense. You''re trying to define 10
functions with the same name? When you call the method, how do you
know which one you are calling?

def ok(me)
  for i in 1..10
    @hello[i] = me
  end
end

-- 
Urban Artography
http://artography.ath.cx

On 28/03/2005, at 6:13 AM, Lucas Carlson wrote:
> I would also love to be able to do this in Ruby:
>
>  class Test
>      
>      for i in 1..10
>          def ok(me)
>              @hello[i] = me
>          end
>      end
for i in 1..10
	define_method("action#{i}") do
		# do something
	end
end

And a more practical example, this Heiraki code snippet:

   for action, list_method in {:up => :move_higher, :down => 
:move_lower, :top => :move_to_top, :bottom => :move_to_bottom} do
     define_method(action) do
       if @params[''id'']
         @chapter = Chapter.find(@params[''id''])
         @chapter.send(list_method)
       end
       redirect_to_chapter @chapter
     end
   end

- tim lucas

Rob Park wrote:
> Conditional definition of methods? Then if you call the method and
> it''s not there, you get a NoMethodError. What is wrong with this?
:
> 
> @allow_foo = true
> def foo(bar)
>   return nil if !@allow_foo
>   @wibble = bar
> end
This will not work, unfortunately. Use this:

def self.allow_foo() true end
def foo(bar)
   return nil unless self.class.allow_foo
   @wibble = bar
end