each

# File railties/lib/rails_generator/lookup.rb, line 197
      def each
        Gem::cache.search(/_generator$/).inject({}) { |latest, gem|
          hem = latest[gem.name]
          latest[gem.name] = gem if hem.nil? or gem.version > hem.version
          latest
        }.values.each { |gem|
          yield Spec.new(gem.name.sub(/_generator$/, ''), gem.full_gem_path, label)
        }
      end