Rendering a different Javascript file in respond_to

I am stuck in an (apparently) simple problem. In my event_controller I have the i_like_it action:

  def i_like_it
    @event = Event.find(params[:id])

    ... # logic

    respond_to do |format|
      format.js
    end
  end

In my case "i_like_it" is called with :method => PUT (it is an Ajax call, "i_like_it.js.erb" will be returned as a script and it wil be executed on the browser.)

I would like render a Javascript file with a different name (not i_like_it.js.erb) , but I haven't found any option in the Rails API docs.

respond_to do |format|
  format.js { render ??? }
end

Rails can render vanilla JavaScript with :js option, but I don't want use Javascript in the controller.

Do you have any suggestion ?

Thank you, Alessandro DS