从哈希中提取值 [英] Extracting values from a hash

问题描述

Hello Im使用HTTParty来调用一个远程json文件，我需要提取这个URL以用于我的一个测试。
json格式如下所示：

 manifest：{
header：{
generated：xxxxxxxxxxxxxxx，
name： xxxxxxxxxxx，
version：1.0.0
}，
files：[{
file：blimp.zip，
 url：http：//www.xxx.xx/restaurants_blimp.zip，
校验和：ee98c9455b8d7ba6556f53256f95
}，{
file：yard.zip ，
url：www.xxx.xx / yard.zip，
校验和：e66aa3d123f804f34afc622b5
} 
  

在irb上我可以得到所有的子哈希示例：['manifest'] ['files']，我只能得到url，如果我预先指定哪个一个..比如放文件['manifest'] ['files'] ['1'] ['url']< - 这对irb有用，但是因为我需要获取所有网址，这就是为什么我se .each，但它给了我一个无法转换为字符串错误或类似的

 ＃！/ usr / bin / env ruby​​ 
 
需要'httparty'
 
 HOST = ARGV [0] 
 ID = ARGV [1] 
 VERSION = ARGV [2] 
 
 
 class MyApi 
 include HTTParty 
 end 
 
 file = MyApi.get（http：//＃{HOST} / v1 / dc / manifest /＃ {ID} /＃{VERSION}）
 
 
 file.each do | item | 
 puts item ['manifest'] ['files'] ['url'] 
 end 
  

无法正常工作，但我可以在IRB上做一个：

放置item ['manifest'] ['files'] [2] ['url'] < - 这会给我的网址，但与.each将只是抱怨不能转换为字符串或类似的

解决方案

请尝试以下操作：

 ＃！/ usr / bin / env ruby​​ 
 
需要'httparty' 
 
（HOST，ID，VERSION）= ARGV 
 
 class MyApi 
包含HTTParty 
格式：json 
结束
 
 response = MyApi.get（http：//＃{HOST} / v1 / dc / manifest /＃{ID} /＃{VERSION}）
 
把response.inspect 
  

添加格式：json 告诉HTTParty将响应解析为JSON。然后你会得到一个散列，你可以正确地迭代。

Hello Im using HTTParty to call for a remote json file that I need to extract the URL's to use in one of my tests.. the json format goes something like:

  "manifest" : {
    "header" : {
      "generated" : "xxxxxxxxxxxxxxx",
      "name" : "xxxxxxxxxxx",
      "version" : "1.0.0"
    },
    "files" : [ {
      "file" : "blimp.zip",
      "url" : "http://www.xxx.xx/restaurants_blimp.zip",
      "checksum" : "ee98c9455b8d7ba6556f53256f95"
    }, {
      "file" : "yard.zip",
      "url" : "www.xxx.xx/yard.zip",
      "checksum" : "e66aa3d123f804f34afc622b5"
    }

on irb I can get all the sub hashes inside example: ['manifest']['files'] and I can only get the url if I expecify which one.. like for example puts file['manifest']['files']['1']['url'] <-- this does work on irb but since I need to get ALL url's this is why I use .each but it gives me a cant convert to string error or similar

#!/usr/bin/env ruby

require 'httparty'

HOST=ARGV[0]
ID=ARGV[1]
VERSION=ARGV[2]


class MyApi
  include HTTParty
end

file = MyApi.get("http://#{HOST}/v1/dc/manifest/#{ID}/#{VERSION}")


file.each do |item|
 puts item['manifest']['files']['url']
end

not working but I can on IRB do a:

puts item['manifest']['files'][2]['url'] <-- and this will give me the url but with the .each will just complaint about cant convert to string or similar

解决方案

Try the following:

#!/usr/bin/env ruby

require 'httparty'

(HOST, ID, VERSION) = ARGV

class MyApi
  include HTTParty
  format :json
end

response = MyApi.get("http://#{HOST}/v1/dc/manifest/#{ID}/#{VERSION}")

puts response.inspect

The addition of the format :json tells HTTParty to parse the response as JSON. Then you'll get a hash you can iterate over properly.

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