更改JSON对象的某个值

这是原始的JSON对象:

{"num":11,"content":"puss\n","percentage":0}

我要替换11与12,即改变"民"的值.

{"num":12,"content":"puss\n","percentage":0}

请用Ruby语言描述它.

使用原始json字符串转换为哈希对象JSON#parse.根据需要更改哈希对象.然后使用以下命令将其转换回json字符串JSON#dump:

require 'json'

raw_json = '{"num":11,"content":"puss\n","percentage":0}'
h = JSON.parse(raw_json)
h['num'] += 1
JSON.dump(h)  # => '{"num":12,"content":"puss\n","percentage":0}'