Rails - Aug 2007 - How can I return a json packet?

I used extjs and ror,this is the part of my ror code:

  def create

    @enterprise = Enterprise.new(@params[:enterprise])

    p @enterprise

   if @enterprise.save
      flash[:note] = ''Enterprise unit was successfully
created.''
      p "michael"
      redirect_to(:action=>index)


    else
      p "error"
      render_action ''new''
    end
    p ''end''
  end

but each time my explore can''t direct to another page.I ask the
extjs,here is the ansower:

Form''s submit method performs an Asynchronous submit via an Ajax
request. It looks for a success attribute in the JSON packet which is
returned by the server-side. Change the response to {success: true}
and then in your success handler redirect the page via JS.

so how can I return a json packet from ror


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