From: Brian Adkins <lojicdotcom@...>
Date: 2007-10-12T01:05:02+09:00
Subject: Re: Using strings to drill down into objects

On Oct 11, 8:32 am, mortee <mortee.li...@kavemalna.hu> wrote:
> Ross X Dawson wrote:
> >     # lambda function to drill down object hierarchy
> >     drill_down = lambda do |obj, method_name|
> >                           o ||= obj
> >                           method_name.split('.').each {|m| o = o.send(m) if
> > o.respond_to?(m)}
> >                           o
> >                   end
>
> > methods = ['lookup1.code', 'lookup1.name']
>
> > report_value = drill_down.call(my_object_with_lookups, methods)
>
> I'm not sure what your intent is, but I guess this code won't work.
>
> First, unless you define it before creating the lambda, "o" won't exist
> in its binding, so you can't call o ||= obj.

Are you sure about that?

brian@imagine:~$ irb
irb(main):001:0> x ||= 7
=> 7
irb(main):002:0> x
=> 7