提取红宝石

Question

由哈希我有一个查询字符串，如下所示的URL：

http://localhost:3000/events?appointment_practices%5B10%5D=Injury&appointment_practices%5B18%5D=Immigration&appointment_practices%5B8%5D=Bankruptcy 

appointment_practices其实是我一个重定向时插入查询字符串的哈希：

appointment_practices = practices.reduce({}) do |acc, practice| 
    acc[practice.id] = practice.class.name 
    acc 
end 
redirect_to events_path(appointment_practices: appointment_practices) 

现在我想分析该查询字符串。当我试图用decode_www_form解析它，它返回一个零元素的数组：

[nil] 

这是给我的零元素的代码：

@http_refer = @_env['HTTP_REFERER'] 
begin 
    uri = URI.parse @http_refer 
    practices = Hash[URI::decode_www_form(uri.query)].values_at('appointment_practices') 
    puts "practices: #{practices}" 
rescue StandardError 
end 

我试图提取哈希值。例如，在appointment_practices％5B10％5D =伤害中，id是10，练习是伤害。

除了正则表达式，我还有其他的选择吗？

Answer 1

您可以使用Rack::Utils.parse_nested_query：

require 'uri' 
require 'rack' 

uri = URI.parse('http://localhost:3000/events?appointment_practices%5B10%5D=Injury&appointment_practices%5B18%5D=Immigration&appointment_practices%5B8%5D=Bankruptcy') 
Rack::Utils.parse_nested_query(uri.query) 
#=> {"appointment_practices"=>{"10"=>"Injury", "18"=>"Immigration", "8"=>"Bankruptcy"}}