# File lib/rails-installer.rb, line 371
  def rails_version_to_freeze
    if @@rails_version
      return "= #{@@rails_version}"
    else
      specs = Gem.source_index.find_name(app_name,["= #{@install_version}"])
      unless specs.to_a.size > 0
        raise InstallFailed, "Can't locate version #{@install_version.first}!"
      end
          
      rails_dep = specs.first.dependencies.detect {|a| a.name=='rails'}
      version = rails_dep.version_requirements.to_s
      return version
    end
  end