?
Solved

Ruby error

Posted on 2011-09-06
8
Medium Priority
?
467 Views
Last Modified: 2012-05-12
I'm getting the following error message when trying to run a ruby script.  I listed the beginning of the script for reference.  Please help.


<internal:lib/rubygems/custom_require>:29:in `require': no such file to load -- exceptions (LoadError)
        from <internal:lib/rubygems/custom_require>:29:in `require'
        from ./ssh_helpers.rb:6:in `<main>'

-------------------------SCRIPT IS BELOW-------------------------------------

#!/usr/bin/env ruby
require 'rubygems'
require 'open4'
require 'socket'

require 'exceptions'


0
Comment
Question by:johncosentino
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
8 Comments
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36489058
Its this line that's causing the issue:

require 'exceptions'

What are you trying to require? is this a gem or a separate ruby file?

Andrew
0
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36489064
To Clarify what the error message is, its trying to explain, it doesn't know what 'exceptions' is - it isn't an installed gem, nor is there an 'exceptions.rb' file in the same directory as this script
0
 

Author Comment

by:johncosentino
ID: 36489135
This is a separate ruby file, and I confirmed that the exceptions.rb file is in the same directory as the script in question.
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:johncosentino
ID: 36490295
So I've found a fix, though I'm still not sure what causes the problem.

if you change the line in the script from require 'exceptions' to require_relative 'exceptions' the problem is resolved.

Apparently the "_relative" tells the script to look in the current directory?  
0
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36490326
The only thing I can think off, is that ruby is trying to use system call with it being 'exceptions'?
One other thing you could try would be to rename the file to 'my_exceptions.rb' and then
require 'my_exceptions'

By using _relative you're forcing ruby to check the current directory first.

0
 

Author Comment

by:johncosentino
ID: 36490361
This might be a stupid question, but why wouldn't it check the current directory first with just "require"....what does "require" check first?
0
 
LVL 10

Expert Comment

by:Andrew Doades
ID: 36490382
Are you running this script from within the directory its located?

Have you done something like this:
cd /ruby_files/
ruby test.rb

So when you run the ruby file, you're running it from the same directory?

or are you running it like this:
ruby ruby_files/test.rb
0
 
LVL 12

Accepted Solution

by:
JESii earned 2000 total points
ID: 36492615
ruby sets up a number of directories that it looks in for locating files that are required.  You can see what that is on your system by typing:
   ruby -e 'puts $:'
(The $: is a global variable that contains the load paths for load / require expressions)

It's kind of a linux convention to not  automatically look in the current directory; this avoids the scenario where someone puts a malicious file in your current directory to has the same name as another command and therefore gets executed when you run that command. That's why in Linux (or Mac Terminal), you have to type:
   ./command_name
to run something from the current directory.

And that's why there's require_relative... to make it easier to access the current directory for loaded or required files.
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

I recently rediscovered rails when I needed a holiday project and decided to build a management dashboard for the company where I work.  With it being a project done in my free time, I could focus my time on learning the basics rather than trying to…
Recently I spent hours debugging an issue in a Rails project where ActiveRecord was causing MySQL errors trying to create a User object of a class at the top level of a Single Table Inheritance model structure.  It turns out `.create` behaves differ…
This tutorial will teach you the special effect of super speed similar to the fictional character Wally West aka "The Flash" After Shake : http://www.videocopilot.net/presets/after_shake/ All lightning effects with instructions : http://www.mediaf…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question