From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-10-29T01:54:43+09:00
Subject: Re: undefined method `find' for.:Module

On Thu, Oct 28, 2010 at 6:42 PM, John Hammink <john@johnhammink.com> wrote:
> Hello,
>
> I am quite new at Ruby (we use it for test automation in conjunction
> with Cucumber, where it works great!)  but as a stand-alone, I'm finding
> myself more productive with Python.  Maybe that's just me.
>
> I have to confess I do not know what the issue is. When I try to run the
> attached script (note:  this example is copied  *EXACTLY* from Ruby
> Cookbook)  I am given the following error at Windows cmdline:
>
> E:\Sounds\Digital>ruby Froop.rb
> Froop.rb:6:in `match': undefined method `find' for Froop:Module
> (NoMethodError)
>        from Froop.rb:12:in `<main>'

You are calling find as a standalone method, but the find library
creates a Find class:

require 'find'

module Froop
        def match(*paths)
                matched=[]
                Find.find(*paths) { |path| matched << path if yield path }
                return matched
        end
        module_function :match
end

Froop.match("./") { |p| ext = p[-4...p.size]; ext && ext.downcase == "mp3" }

This works, or at least, doesn't raise an error about the find method.

>
> Note that the Froop.rb is in same directory from where I am attempting
> to run it.   Ruby doesn't seem to recognize it's own require statement:
>
> require 'find'
>
> on the first line of the file, which is positively baffling.
>
> Note, that when I try to only put my function in the file and call Froop
> from the command line (how I originally tried to do it), that's a lost
> cause too:
>
> E:\Sounds\Digital>irb
> irb(main):001:0> require 'Froop'
> LoadError: no such file to load -- Froop
>        from <internal:lib/rubygems/custom_require>:29:in `require'
>        from <internal:lib/rubygems/custom_require>:29:in `require'
>        from (irb):1
>        from C:/Ruby192/bin/irb:12:in `<main>'
> irb(main):002:0> Froop.match("./") { |p| ext = p[-4...p.size]; ext &&
> ext.downcase == "mp3" }
> NameError: uninitialized constant Object::Froop
>        from (irb):2
>        from C:/Ruby192/bin/irb:12:in `<main>'
> irb(main):003:0>
>
> Seriously what gives?  I'm ready to put Ruby in the Bin and switch to
> Python, but my heart won't let me...yet.  :(

You are using ruby 1.9.2, which has removed "." from the LOAD_PATH. You can use:

require './Froop'

or add "." to the load path yourself:

$: << "."

Don't lose faith in Ruby, you'll be glad in the end if you persevere :-)

Jesus.