使用ruby将JSON数据转换为数组

Question

这是我的JSON代码

{
"jobs": [
{
  "id": 1,
  "title": "Software Developer",
  "applicants": [
    {
      "id": 1,
      "name": "Rich Hickey",
      "tags": ["clojure", "java", "immutability", "datomic", "transducers"]
    },
    {
      "id": 2,
      "name": "Guido van Rossum",
      "tags": ["python", "google", "bdfl", "drop-box"]
    }
  ]
},
{
  "id": 2,
  "title": "Software Architect",
  "applicants": [
    {
      "id": 42,
      "name": "Rob Pike",
      "tags": ["plan-9", "TUPE", "go", "google", "sawzall"]
    },
    {
      "id": 2,
      "name": "Guido van Rossum",
      "tags": ["python", "google", "bdfl", "drop-box"]
    },
    {
      "id": 1337,
      "name": "Jeffrey Dean",
      "tags": ["spanner", "BigTable", "MapReduce", "deep learning", "massive clusters"]
    }
  ]
}
]
}

我想使用ruby将"Jobs“列表放入一个数组中。到目前为止，我有以下代码。

require 'json'
file = File.read(filepath)
data_hash = JSON.parse(file)

如何在data_hash上迭代，选择我想要的信息并将其放入数组中？

Answer 1

您可以使用Array#each，因为data_hash['jobs']包含一个作业数组：

data_hash['jobs'].each {|job| ... }

Answer 2

像这样，

arr = Array.new
data_hash.each { |job| 
arr.insert(job['name'])
}

Answer 3

使用Array#map编写较短的代码

data_hash['jobs'].map do |job| 
   # Do whatever you want with the job here
   properties = %w(title applicants)
   job.select{ |key| properties.include?(key) }
end