Gem found in irb, not in Ruby

Question

I have some gems installed, and I'm trying to use them in a Ruby app:

require 'rubygems'
require 'mygem'

When I run the app, though, I get this error: <internal:lib/rubygems/custom_require>:29:inrequire': no such file to load -- mygem (LoadError)`

But if I try requiring the gem inside irb (making sure to `require 'rubygems' first), it works fine. What am I supposed to do? I tried googling for this problem, but didn't understand.

Running a which on ruby, gem, and irb shows that they're all in /opt/local/bin/, i.e.,

> which ruby
/opt/local/bin/ruby
> which gem
/opt/local/bin/gem
> which irb
/opt/local/bin/irb

Update to answer the questions posed (yep, irb and ruby are pointing to different folders):

$LOAD_PATH and $: in irb both contain seem to be pointing to ruby 1.8 folders:

/opt/local/lib/ruby/site_ruby/1.8
/opt/local/lib/ruby/site_ruby/1.8/i686-darwin10
/opt/local/lib/ruby/site_ruby
/opt/local/lib/ruby/vendor_ruby/1.8
/opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin10
/opt/local/lib/ruby/vendor_ruby
/opt/local/lib/ruby/1.8
/opt/local/lib/ruby/1.8/i686-darwin10
.

$: in ruby points to ruby 1.9.1 folders:

/usr/local/lib/ruby/site_ruby/1.9.1
/usr/local/lib/ruby/site_ruby/1.9.1/i386-darwin9.8.0
/usr/local/lib/ruby/site_ruby
/usr/local/lib/ruby/vendor_ruby/1.9.1
/usr/local/lib/ruby/vendor_ruby/1.9.1/i386-darwin9.8.0
/usr/local/lib/ruby/vendor_ruby
/usr/local/lib/ruby/1.9.1
/usr/local/lib/ruby/1.9.1/i386-darwin9.8.0

gem env shows

RubyGems Environment:
  - RUBYGEMS VERSION: 1.4.1
  - RUBY VERSION: 1.8.7 (2010-12-23 patchlevel 330) [i686-darwin10]
  - INSTALLATION DIRECTORY: /opt/local/lib/ruby/gems/1.8
  - RUBY EXECUTABLE: /opt/local/bin/ruby
  - EXECUTABLE DIRECTORY: /opt/local/bin
  - RUBYGEMS PLATFORMS:
    - ruby
    - x86-darwin-10
  - GEM PATHS:
     - /opt/local/lib/ruby/gems/1.8
  - GEM CONFIGURATION:
     - :update_sources => true
     - :verbose => true
     - :benchmark => false
     - :backtrace => false
     - :bulk_threshold => 1000
     - "gempath" => ["/opt/local/lib/ruby/gems/1.8"]
     - :sources => ["http://rubygems.org/", "http://gems.github.com", "http://gems.github.com"]
  - REMOTE SOURCES:
     - http://rubygems.org/
     - http://gems.github.com
     - http://gems.github.com

Gem.path in irb points to

/Users/grautur/.gem/ruby/1.8
/usr/local/lib/ruby/gems/1.8

Gem.path in ruby points to

/Users/grautur/.gem/ruby/1.9.1
/usr/local/lib/ruby/gems/1.9.1

What do your `$LOAD_PATH` or `$:` variables contain? Examining those in each environment will probably be fairly informative. — Damien Wilson, May 31 '11 at 23:17
Hmm, irb seems to be using ruby 1.8 (`$LOAD_PATH` and `$:` are both /opt/local/lib/ruby/site_ruby/1.8,/opt/local/lib/ruby/site_ruby/1.8/i686-darwin10,/opt/local/lib/ruby/site_ruby,/opt/local/lib/ruby/vendor_ruby/1.8,/opt/local/lib/ruby/vendor_ruby/1.8/i686-darwin10,/opt/local/lib/ruby/vendor_ruby,/opt/local/lib/ruby/1.8,/opt/local/lib/ruby/1.8/i686-darwin10,.), while ruby is using ruby 1.9.1 (`$LOAD_PATH` is empty, `$:` is the 1.9.1 versions of the previous paths). — grautur, Jun 01 '11 at 03:21

score 2 · Answer 1 · edited May 23 '17 at 12:13

2

I'm not sure what's going on. However, the following may help.

In irb, do

require 'rubygems'
require 'mygem'
puts $:

and then, in ruby, do

require 'rubygems'
puts $:

and show us what you get if you haven't worked it out.

Edit: also print out the results of doing gem env on the command line.

Edit 2: See what happens if you type in puts Gem.path after you've required rubygems in both irb and ruby. See thanks to Matt for describing Rubygems

edited May 23 '17 at 12:13

Community

1
1

answered May 30 '11 at 23:28

Andrew Grimm

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Hmm, yep, ruby and irb seem to be using different paths (ruby is using 1.9.1 folders, and irb is using 1.8 folders). Do you know how I get them to use the same path? – grautur Jun 01 '11 at 03:34
@grautur: I don't know what to do. Sorry. – Andrew Grimm Jun 01 '11 at 23:05

score 1 · Answer 2 · edited Mar 26 '15 at 13:33

1

You will have to add gem install mygem in your Gamefile and then run bundle install command. Your application will work correctly after doing this.

edited Mar 26 '15 at 13:33

skuntsel

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answered Mar 26 '15 at 12:58

user2756340

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score 1 · Answer 3 · answered May 30 '11 at 23:09

1

You may try to add gem 'mygem' before the require, but that should not be necessary.

answered May 30 '11 at 23:09

Michaël Witrant

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score 0 · Answer 4 · edited May 23 '17 at 11:58

0

I had a similar problem. The solution I found eventually was to setup rvm (ruby version manager) on my system and use it to setup a new ruby environment. it also makes it easy to switch between ruby versions of sets of gems.

edited May 23 '17 at 11:58

Community

1
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answered Jun 28 '11 at 20:51

Nat

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Gem found in irb, not in Ruby

4 Answers4

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