如何在Rails中的单独域上设置cookie

class CookiesController< ApplicationController
  def set_cookie
    cookies[:my_cookie] = {
      value: "This is my cookie value",
      domain: ".example.com",
      expires: 1.hour.from_now
    }
    render plain: "Cookie is set"
  end
end

class CookiesController< ApplicationController
  def set_signed_cookie
    cookies.signed[:my_signed_cookie] = {
      value: "This is my signed cookie value",
      domain: ".example.com",
      expires: 1.hour.from_now
    }
    render plain: "Signed cookie is set"
  end
end