ruby - 用ruby修改json文件

Question

我有一个需要使用 ruby​​ 脚本访问和修改的 json 文件。我知道如何打开一个 json，如何编写一个新的，但我可以修改现有的吗？

我已经搜索了一下，但我还没有找到任何有用的东西......只有结果对待不同的编程语言..

例子:我想修改一个错误的数据，如下图，Anna的姓。

员工.json

{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

=>

{"employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"David"},
    {"firstName":"Peter", "lastName":"Jones"}
]}

提前致谢

Answer 1

将 json 转换为哈希，编辑哈希，转换回 json:

require 'json'

a = '{"employees":[
      {"firstName":"John", "lastName":"Doe"},
      {"firstName":"Anna", "lastName":"Smith"},
      {"firstName":"Peter", "lastName":"Jones"}
    ]}'

# Converting JSON to Hash
hash = JSON.parse a
# => {"employees"=>[{"firstName"=>"John", "lastName"=>"Doe"}, {"firstName"=>"Anna", "lastName"=>"Smith"}, {"firstName"=>"Peter", "lastName"=>"Jones"}]} 

# Modifying Hash as required
hash["employees"][1]["lastName"]  = "David"

# Modified Hash
hash
# => {"employees"=>[{"firstName"=>"John", "lastName"=>"Doe"}, {"firstName"=>"Anna", "lastName"=>"David"}, {"firstName"=>"Peter", "lastName"=>"Jones"}]}


# Converting Hash back to JSON
hash.to_json
#  "{\"employees\":[{\"firstName\":\"John\",\"lastName\":\"Doe\"}, {\"firstName\":\"Anna\",\"lastName\":\"David\"}, {\"firstName\":\"Peter\",\"lastName\":\"Jones\"}]}"

我已经直接修改了散列，因为我可以看到确切的索引并且遍历散列不是问题。但在现实世界的示例中，您可能希望通过哈希来查找 key 然后修改它，而不是像上面的示例那样直接执行。

您可以使用 pretty_generate 漂亮地打印您的 json。这里:

hash
# => {"employees"=>[{"firstName"=>"John", "lastName"=>"Doe"}, {"firstName"=>"Anna", "lastName"=>"David"}, {"firstName"=>"Peter", "lastName"=>"Jones"}]}

puts JSON.pretty_generate hash
#{
#  "employees": [
#    {
#      "firstName": "John",
#      "lastName": "Doe"
#    },
#    {
#      "firstName": "Anna",
#      "lastName": "David"
#    },
#    {
#      "firstName": "Peter",
#      "lastName": "Jones"
#    }
#  ]
#}