Question

我通过客户端ruby脚本对Ruby on Rails服务器进行JSON调用，该脚本返回以下JSON：

get_data.rb

require 'net/http'
require 'open-uri'
require 'json'

def get_functions(serial_number, function)
  request_uri = "http://localhost:3000/devices/#{serial_number}"
  buffer = open(request_uri).read
  result = JSON.parse(buffer)
  puts result
end

{ "serial_number" => "111aaa",
  "device_functions" => [
    { "can_scan" => true,
      "can_halt" => true
    }
  ],
  "host_options" => [
    { "exclude_ip" => "10.10.10.100-110",
      "scan_ip" => "10.10.10.1"
    }
  ]
}

现在，我想从响应中提取某些值，以确定在客户端可以/不能做什么：

scan.rb

if get_functions('111aaa', 'can_scan')
  result = %x( ping 10.10.10.1 )
else
  result = "Not allowed to perform action!"
end

我仍然坚持如何从 get_data.rb 中的JSON中提取can_scan的值，以便我的get_functions方法能够运行if声明正确。

Answer 1

您的get_functions正在返回nil，因为最后一行是I / O操作（puts）。将您的功能更改为：

def get_functions(serial_number, function)
  request_uri = "http://localhost:3000/devices/#{serial_number}"
  buffer = open(request_uri).read
  result = JSON.parse(buffer)
  puts result
  result
end

访问哈希：

result = get_functions(serial_number, function)
result["device_functions"].first["can_scan"]

从Ruby中获取JSON响应的价值

1 个答案: