Change certain value of a JSON object [duplicate]

问题

This question already has answers here:

Editing JSON Array contents in Ruby (2 answers)

Closed 4 years ago.

This is the raw JSON object:

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

I want to replace 11 with 12, namely change the value of "num".

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

Please describe it in Ruby language.

回答1:

Convert the raw json string into hash object using JSON#parse. Change the hash object as you want. Then convert it back to json string using 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}'

来源：https://stackoverflow.com/questions/34454553/change-certain-value-of-a-json-object