迭代视图中的对象，JSON 哈希

Question

我已经在外部解析了 JSON api，现在它是一个哈希：

["statement", {"generated"=>"2015-01-11", "due"=>"2015-01-25", "period"=>{"from"=>"2015-01-26", "to"=>"2015-02-25"}}

我用过：

require 'json/pure'
require 'open-uri'

 def index
   content = open("MY_URL").read
   @hash = JSON.parse content
   render @hash
 end

这给了我视图上的整个哈希输出：

<% @hash.each do |hash| %>
<%= hash %>
<% end %>

假设我想分别打印生成、到期和期间，我将如何执行此操作。我离得很近，我知道。

数组：

 ["statement", {"generated"=>"2015-01-11", "due"=>"2015-01-25", "period"=>{"from"=>"2015-01-26", "to"=>"2015-02-25"}}] ["total", 136.03] ["package", {"subscriptions"=>[{"type"=>"tv", "name"=>"Variety with Movies", "cost"=>50.0}, {"type"=>"talk", "name"=>"Talk Anytime", "cost"=>5.0}, {"type"=>"broadband", "name"=>"Fibre Unlimited", "cost"=>16.4}], "total"=>71.4}] ["callCharges", {"calls"=>[{"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"07716393769", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}, {"called"=>"02074351359", "duration"=>"00:23:03", "cost"=>2.13}], "total"=>59.64}] ["Store", {"rentals"=>[{"title"=>"50 Shades of Grey", "cost"=>4.99}], "buyAndKeep"=>[{"title"=>"That's what she said", "cost"=>9.99}, {"title"=>"Broke back mountain", "cost"=>9.99}], "total"=>24.97}] [:prefixes, ["tasks", "application"]] [:template, "index"]

Answer 1

简而言之，您需要从哈希中提取值以单独打印它们。

您编写的第一段代码实际上是一个数组，而不是哈希。数组的第一个元素是字符串，第二个元素是散列。您要做的第一件事是仅使用哈希创建一个变量，然后删除字符串：

<% @hash_values = @hash[1] %>

使用此哈希，您希望通过键查找来提取“生成”、“到期”和“期间”的值：

<%= @hash_values['generated'] %>
<%= @hash_values['due'] %>
<%= @hash_values['period'] %>

对于“句号”，结果是一个哈希。你们很多人想要更多地提取单个值以进行格式化，例如：

<%= @hash_values['period']['from'] %> to <%= @hash_values['period']['to'] %>