Rails gems:install task that does not depend on database gems being installed already!

gistfile1.txt

task :gems_install do
  GEMS = []
  module Rails
    class Config
      def gem(name, options = {})
        GEMS << Rails::GemDependency.new(name, options)
      end
      def method_missing(*args)
        # ignore
      end
    end
    class Initializer
      def self.run
        yield Config.new
      end
    end
    class GemDependency
      def installed?
        # the stock installed? method does not work for me, it ignores many installed gems
        # since it only checks loaded gems, not all gems.
        self.specification
      end
    end
  end
  
  require File.dirname(__FILE__) + '/config/environment'
  
  GEMS.each(&:install)
end