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Gem::Specification.new do |s|
  s.name        = 'topic'
  s.version     = '1.0.0'
  s.date        = '2012-12-30'
  s.files   = ["lib/models/topic.rb"]
end

gem 'topic', :path => '.'

uninitialized constant ApplicationController::Topic

gem 'topic', :path => './topic'

# in topic/lib/topic.rb
module Topic
end

#require other parts of the gem
require 'topic/foo'
require 'topic/bar'