Force ruby to use dbi Gem instead of dbi in site_ruby

Question

I'm using:

• Windows 7
• Ruby 1.8.6 One-Click Installer
• DBI version 0.4.3 installed using RubyGems

What I see when executing these commands:

C:>ruby -v

ruby 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]

C:>gem -v

1.3.1

C:>ruby -r rubygems -r dbi -e "puts DBI::VERSION"

0.2.2

C:>gem list dbi

*** LOCAL GEMS ***

dbi (0.4.3)

C:>gem environment

RubyGems Environment:

• RUBYGEMS VERSION: 1.3.1
• RUBY VERSION: 1.8.6 (2008-08-11 patchlevel 287) [i386-mswin32]
• INSTALLATION DIRECTORY: C:/Ruby/lib/ruby/gems/1.8
• RUBY EXECUTABLE: C:/Ruby/bin/ruby.exe
• EXECUTABLE DIRECTORY: C:/Ruby/bin
• RUBYGEMS PLATFORMS:
  • ruby
  • x86-mswin32-60
• GEM PATHS:
  • C:/Ruby/lib/ruby/gems/1.8
  • C:/Users/sutch/.gem/ruby/1.8
• GEM CONFIGURATION:
  • :update_sources => true
  • :verbose => true
  • :benchmark => false
  • :backtrace => false
  • :bulk_threshold => 1000
• REMOTE SOURCES:
  • http://gems.rubyforge.org/

Why do ruby scripts use the DBI installed in site_ruby rather than the DBI installed with RubyGems?

---

Update to respond to Luis Lavena's answer...

Here's what happened when I attempted what you suggest:

C:>ruby -r rubygems -e "require 'rubygems'; puts DBI::VERSION"

-e:1: uninitialized constant DBI (NameError)

And when I updated to require DBI:

C:>ruby -r rubygems -e "require 'rubygems' ; require 'dbi' ; puts DBI::VERSION"

0.2.2

Why wouldn't RubyGems override the built-in library?

Answer 1

Hello,

Using ruby -r you're using Ruby builtin require instead of the one redefined by RubyGems.

Try this:

ruby -r rubygems -e "require 'dbi'; puts DBI::VERSION"

That should do the trick.

FYI: this has been improved in newer versions of Ruby (1.9 versions, none of the 1.8 has this behavior).

Hope that helps.

Answer 2

Hi, I've a similar problem...

When I write require 'dbi' on irb and here's what happened:

irb(main):001:0> require 'dbi' LoadError: no such file to load -- dbi from (irb):1:in `require' from (irb):1

---

My Enviroment scenario is:

C:\Users\eponce>ruby -v ruby 1.8.7 (2010-01-10 patchlevel 249) [i386-mingw32]

C:\Users\eponce>gem -v 1.3.7

C:\Users\eponce>ruby -r rubygems -e "require 'rubygems' ; require 'dbi' ; puts D BI::VERSION" 0.4.5

C:\Users\eponce>gem list dbi

* LOCAL GEMS *

dbi (0.4.5)

C:\Users\eponce>gem environment

RubyGems Environment:

• RUBYGEMS VERSION: 1.3.7

• RUBY VERSION: 1.8.7 (2010-01-10 patchlevel 249) [i386-mingw32]

• INSTALLATION DIRECTORY: C:/Ruby/lib/ruby/gems/1.8

• RUBY EXECUTABLE: C:/Ruby/bin/ruby.exe

• EXECUTABLE DIRECTORY: C:/Ruby/bin

• RUBYGEMS PLATFORMS:

  • ruby

  • x86-mingw32

• GEM PATHS:

  • C:/Ruby/lib/ruby/gems/1.8

  • C:/Users/eponce/.gem/ruby/1.8

• GEM CONFIGURATION:

  • :update_sources => true

  • :verbose => true

  • :benchmark => false

  • :backtrace => false

  • :bulk_threshold => 1000

• REMOTE SOURCES:

  • http://rubygems.org/

And I'm working on Windows 7... I don't know what's happening!!! heeelp!!