Replacing Rails Components | 277

Then we can build the Glue and Og (and, optionally, Raw and Nitro) libraries into
gems and install them:

$ cd glue/

$ gem build glue.gemspec

$ sudo gem install glue-0.50.0.gem

$ cd ../og/

$ gem build og.gemspec

$ sudo gem install og-0.50.0.gem

$ cd ../raw/

$ gem build raw.gemspec

$ sudo gem install raw-0.50.0.gem

$ cd ../nitro/

$ gem build nitro.gemspec

$ sudo gem install nitro-0.50.0.gem

To update the beta gem to the latest source, you can later rundarcs

pullfrom thenitroprojectdirectory. Then recheck the Facets depen-

dency, and run the preceding code again to rebuild and reinstall the

latest gems.

Verify that the Og gem is correctly installed:

$ gem list --local og

*** LOCAL GEMS ***

og (0.50.0)

State of the art object-relational mapping system

Using Og with Rails. We will use a custom Rails initializer to load Og and work around
a few of its Rails incompatibilities. All Ruby files inconfig/initializersare loaded auto-
matically on Rails startup, so this is a perfect place to start Og. Here is the initializer:

config/initializers/og.rb

1. Require our custom edge version of Og

gem 'og', '=0.50.0'

# 2. Work around the RubyGems / Dependencies version of require

class Object

alias_method :require_with_rubygems, :require

alias_method :require, :gem_original_require

require_with_rubygems 'og'

# Restore the Dependencies require for future require calls

alias_method :require, :require_with_rubygems

end

# 3. Define autoload path so the model can find the Orderable mixin.

# This is relative to $LOAD_PATH, which includes the lib path in the og

# gem directory.