ruby：从嵌套的json中提取字段
我正在努力教自己ruby并解决工作中的问题。 我的最终目标是从API中提取JSON响应中的许多字段中的三个，操作并转储到CSV以进行执行报告。
JSON的结构是：
{ "status": 200, "data": { "total": 251, "alerts": [ { "dataPoint": "x", "ackedBy": "x", "dataSourceInstance": "x", "dataSource": "x", "host": "x", "endOn": 0, "ackedOn": 1385085190, "dataSourceInstanceId": 588384, "hostId": 935, "type": "alert", "dataSourceId": 694, "ackedOnLocal": "2013-11-21 17:53:10 PST", "id": 6170384, "startOn": 1385084917, "thresholds": "!= 1 1 1", "endOnLocal": "", "level": "error", "ackComment": "x", "value": "No Data", "hostDataSourceId": 211986, "acked": true, "hostGroups": [{ "alertEnable": true, "createdOn": 1362084592, "id": 21, "parentId": 78, "description": "", "appliesTo": "", "name": "2600hz", "fullPath": "x" }], "startOnLocal": "2013-11-21 17:48:37 PST" }, 具体来说，我想提取出dataPoint ， startOn ， ackedOn 。
我想我需要首先提取总值，所以我知道我有多少警报。 这将帮助我遍历警报实例。
*url = "https://xyz" uri = URI(url) http = Net::HTTP.new(uri.host, 443) http.use_ssl = true http.verify_mode = OpenSSL::SSL::VERIFY_NONE req = Net::HTTP::Get.new(uri.request_uri) response = http.request(req) # Make sure we had a proper web response if response.code == '200' then # Set up that the total is two levels deep in the json path = JsonPath.new('$.total') # Extract out total field into variable totalAlerts = path.on(response) # Print hash to confirm value pp totalAlerts end*
我被困在试图提取总数。 输出没有显示：
sudo ruby alerts.rb []
有一个更好的方法吗？
试试这个：
# just for demonstration, you would probably do json = JSON.parse(response) json = { "status": 200, "data": { "total": 251, "alerts": [ { "dataPoint": "x", "ackedBy": "x", ...
仅限总数：
total = json['data']['total']
对于您询问的其他值：
json['data']['alerts'].each do |alerts| # do whatever you want with these... alerts['dataPoint'] alerts['startOn'] alerts['ackedOn']
现在的问题是，你想对结果做些什么？ 你想把它们收集到一个新的哈希？ json['data']['alerts']是一个数组，所以你必须决定如何收集它们。 你可以这样做：
collected_alerts = { 'dataPoints' => [], 'startOns' => [], 'ackedOns' => [] } json['data']['alerts'].each do |alerts| collected_alerts['dataPoints'] << alerts['dataPoint'] collected_alerts['startOns'] << alerts['startOn'] collected_alerts['ackedOns'] << alerts['ackedOn'] end
现在，您可以在collected_alerts获取所有这些值