比较两个JSON字符串，只需要更改的行

Question

我在Ruby中面临有关JSON处理的问题。我有一个字符串str1，几分钟后它变为str2：

str1 = 
'{   "Person1": { "state": [ {"salery": "100", "time": "100"} ],
                 "temp": [{"age": "12","time": "200" }] },
    "person2": { "state": [ {"salery": "12","time": "120"}],
                "temp": [ {"age": "12","time": "220"}]}
}'

更改为：

str1 = 
'{   
      "Person1": { "state": [ {"salery": "changed", "time": "100"} ],
                        "temp": [{"age": "12","time": "200" }] },
      "person2": { "state": [ {"salery": "12","time": "120"}],
                        "temp": [ {"age": "12","time": "220"}]}
}'

根据此更改，我只需要输出更改行，因为这里只有str1行 - ＆gt; str2已更改({"salery": "100" -> "salery": "changed")。

输出：

{
    "Person1": { "state": [ { "salery": "changed","time": "100"} ]  }
}