ruby-on-rails - 如何将 " 替换为空格或删除第一个和最后一个符号？

Question

我得到 xml 数据并从中获得价值。

我需要删除符号 [ 和 ]

这是我的代码，它给了我关于未定义变量的错误：

         @xml = XmlSimple.xml_in(res.content)//here I get xml document
         payKey = @xml["payKey"]//gere I get needed value
         //it looks like "[some character]" so I need to delete [ and ]
         //I tried
         payKey = @xml["payKey"].to_s()//to use tr method
         payKey = payKey.tr("[]", "")//replacing
        redirect_to "https://svcs.sandbox.paypal.com/AdaptivePayments/Pay?cmd=_ap-payment&paykey=#{paykey}"//inserting into url

结果：

            svcs.sandbox.paypal.com/AdaptivePayments/Pay?cmd=_ap-payment&paykey="AP-7NK73769LH704515X"

所以我需要删除“标志。有人可以帮我吗？

Answer 1

我愚蠢的回答

  payKey = payKey[1..20]