From: Josh Cheek <josh.cheek@...>
Date: 2011-08-29T17:54:07+09:00
Subject: Re: load mongo fail

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On Mon, Aug 29, 2011 at 2:45 AM, zuerrong <zuerrong@gmail.com> wrote:

> Hi
>
> I have installed mongo gem firstly, but when I require 'mongo' it get
> failed:
>
> irb(main):001:0> require 'rubygems'
> => true
> irb(main):002:0> require 'mongo'
> NameError: uninitialized constant Mongo
>        from ./mongo.rb:5
>        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in
> `gem_original_require'
>        from /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:36:in
> `require'
>        from (irb):2
>
>
> This is my ruby and gem version:
>
> $ ruby -v
> ruby 1.8.7 (2009-06-12 patchlevel 174) [x86_64-linux]
> $ gem -v
> 1.8.10
>
> Please help, thank you.
>
>

You're using an old version of Ruby that leaves the current directory in the
load path. This means that when you type `require "mongo"`, it is not
requiring the mongo gem, instead it is requiring your local file. Look at
the first line of the backtrace "from ./mongo.rb:5" The path to that file is
./mongo.rb, it's in your current directory. Obviously that file references
`Mongo` on line 5, probably expecting that you'd already required the gem.

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