我如何使用 ruby​​ 迭代这个 json 文档？

我有一个ruby代码块，如下：

require "elasticsearch"
require "json"

search_term = "big data"
city = "Hong Kong"
client = Elasticsearch::Client.new log: true
r = client.search index: 'candidates', body:
{
  query: {
    bool: {
      must: [
        {
          match: {
            tags: search_term
          }
        },
        {
          match: {
            city: city
          }
        }
      ]
    }
  }
} 

它会产生多个返回，如下所示：

{"_index":"candidates","_type":"data",
"_id":"AU3DyAmvtewNSFHuYn88",
"_score":3.889237,
"_source":{"first":"Kota","last":"Okayama","city":"Tokyo","designation":"Systems Engineer","email":"[email protected]","phone":"phone","country":"Japan","industry":"Technology","tags":["remarks","virtualization big data"]}}

我想迭代它并提取各种元素。我努力了

 data = JSON.parse(r)
  data.each do |row|
  puts row["_source"]["first"]
 end

错误是：

no implicit conversion of Hash into String (TypeError)

解决这个问题的最佳方法是什么？

我有解决方案，希望对其他人有帮助。我花了几个小时的时间摆弄和实验。这里是：

require "elasticsearch"
require "json"

search_term = "big data"
city = "Tokyo"
client = Elasticsearch::Client.new log: true

h = client.search index: 'swiss_candidates', body:
{
  query: {
    bool: {
      must: [
        {
          match: {
            tags: search_term
          }
        },
        {
          match: {
            city: city
          }
        }
      ]
    }
  }
} 

data = JSON.parse(h.to_json) 
data["hits"]["hits"].each do |r|
puts r["_id"]
puts r["_source"]["first"]
puts r["_source"]["tags"][1]
puts r["_source"]["screened"][0]
end

重要的事情似乎是将elasticsearch结果转换为Ruby友好的结果。