从 JSON 数组中获取特定的键和值 - Ruby

Question

我是Ruby的初学者，我有以下Json数组：

    "elements": [
        {
          "type": "Contact",          
          "id": "1",
          "createdAt": "131231235",
          "name": "test",
          "updatedAt": "1456328049",
          "accountName": "Mr Test",
          "country": "China",
          "firstName": "Test",
          "lastName": "lastNameTest",
        },
        {
          "type": "Contact",          
          "id": "2",
          "createdAt": "156453447",
          "name": "test2",
          "updatedAt": "124464554",
          "accountName": "Mr Test2",
          "country": "Germany",
          "firstName": "Test2",
          "lastName": "lastNameTest2",
            },...
]

我

只想过滤掉几个键+值：例如，我只想返回id，name，accountName，名字和姓氏。

因此，检查的输出如下：

    "elements": [
        {         
          "id": "1",
          "name": "test",
          "accountName": "Mr Test",
          "firstName": "Test",
          "lastName": "lastNameTest",
        },
        {      
          "id": "2",
          "name": "test2",
          "accountName": "Mr Test2",
          "firstName": "Test2",
          "lastName": "lastNameTest2",
            },...
]

我

尝试了以下方法：创建一个过滤器数组，其中包含我要返回的元素，然后映射到项目上，但随后我卡住了。

filters = []
filters.push("accountName")
filters.push("lastName")
filters.push("firstName")
filters.push("Id")
output["elements"].each do |item|
result = []
item.map {|key,value|filters.include? key}
result.push(?)

谢谢你的帮助。

Answer 1

看看这个，你应该能够从中计算出来：

output = { "elements": [
          {
            "id": "1",
            "name": "test",
            "accountName": "Mr Test",
            "firstName": "Test",
            "lastName": "lastNameTest",
            "somethoong": "sdsad"
          },
          {
            "id": "2",
            "name": "test2",
            "accountName": "Mr Test2",
            "firstName": "Test2",
            "lastName": "lastNameTest2"
            }
          ]}
attribs = %w(accountName lastName firstName id)
output[:elements].each do |item|
  item.delete_if{|k,v| !attribs.include?(k.to_s)}
end