refresh_spec

# File railties/lib/rails/gem_dependency.rb, line 171
    def refresh_spec(directory)
      real_gems = Gem.source_index.installed_source_index
      exact_dep = Gem::Dependency.new(name, "= #{specification.version}")
      matches = real_gems.search(exact_dep)
      installed_spec = matches.first
      if File.exist?(File.dirname(spec_filename(directory)))
        if installed_spec
          # we have a real copy
          # get a fresh spec - matches should only have one element
          # note that there is no reliable method to check that the loaded
          # spec is the same as the copy from real_gems - Gem.activate changes
          # some of the fields
          real_spec = Gem::Specification.load(matches.first.loaded_from)
          write_spec(directory, real_spec)
          puts "Reloaded specification for #{name} from installed gems."
        else
          # the gem isn't installed locally - write out our current specs
          write_spec(directory, specification)
          puts "Gem #{name} not loaded locally - writing out current spec."
        end
      else
        if framework_gem?
          puts "Gem directory for #{name} not found - check if it's loading before rails."
        else
          puts "Something bad is going on - gem directory not found for #{name}."
        end
      end
    end