为什么这两个字符串不相等

Question

在这里瞎了......我无法理解为什么这两个字符串不相等..当我puts他们到终端时他们都是类string当我只是比较它们的输出时是平等的。但不知何故，在我的代码中他们不是......我无法弄清楚原因。

这是我的Ruby代码：

def prep_for_duplicate_webhook
  @redis_cart = Redis.new
  cart_stamp_saved = @redis_cart.get("cart_stamp_saved")
  if cart_stamp_saved.nil?
    cart_stamp_saved = {}
    cart_stamp_saved[:token] = cart_params['token']
    cart_stamp_saved[:updated_at] = cart_params['updated_at']
    @redis_cart.set("cart_stamp_saved", cart_stamp_saved.to_json)
  end
  @cart_stamp_incoming = {}
  @cart_stamp_incoming["token"] = cart_params['token']
  @cart_stamp_incoming["updated_at"] = cart_params['updated_at']
end

def duplicate_webhook?
  prep_for_duplicate_webhook
  @cart_stamp_saved = redis_cart.get("cart_stamp_saved")
  cart_stamp_saved == cart_stamp_incoming.to_json
end

然后我正在比较的哈希就是这两个：

cart_stamp_saved = {"token"=>"4a093432ba5c430dd545b16c0e89f187", 
"updated_at"=>"2017-02-17T15:27:22.923Z"}

cart_stamp_incoming= {"token"=>"4a093432ba5c430dd545b16c0e89f187", 
"updated_at"=>"2017-02-17T15:27:22.923Z"}

如果我只是将上述内容复制并粘贴到新页面中，并执行此操作，则回复为true

pp cart_stamp_saved == cart_stamp_incoming.to_json

我错过了什么？