rails内部的数组使用删除重复

Question

我已经从网络刮取了这个阵列。看起来像这样：

[["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"]]

那么会发生什么呢？它重复了吗？所以我想将上面的数组更改为此（每次都会有所不同，因此需要删除重复项。）：

[["formatted_sum_fees", "£5.60"],
["formatted_price", "£46.50"],
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"],
["formatted_sum_fees", "£3.30"],
["formatted_price", "£27.50"]

此后存在的任何其他内容都是骗局。

我需要的是费用和价格，因此我可以将其保存到数据库：）

由于 萨姆

额外 这是raketask。

require "nokogiri"
require "open-uri"
namespace :task do
  task test: :environment do
    ticketmaster_url = "http://www.ticketmaster.co.uk/derren-brown-miracle-glasgow-04-07-2016/event/370050789149169E?artistid=1408737&majorcatid=10002&minorcatid=53&tpab=-1"
     doc = Nokogiri::HTML(open(ticketmaster_url))
     event_name = nil
     ticket_price = nil
     doc.xpath("//script[@type='text/javascript']/text()").each do |text|
       if text.content =~ /more_options_on_polling/
         ticket_price = text.to_s.scan(/\"(formatted_(?:price|sum_fees))\":\"(.+?)\"/)
         byebug
       end
     end

  end
end

Answer 1

您可以使用

[["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£5.60"], 
["formatted_price", "£46.50"], 
["formatted_sum_fees", "£4.50"], 
["formatted_price", "£37.50"], 
["formatted_sum_fees", "£3.30"], 
["formatted_price", "£27.50"]].uniq

然后结果是：

 [["formatted_sum_fees", "£5.60"], ["formatted_price", "£46.50"], ["formatted_sum_fees", "£4.50"], ["formatted_price", "£37.50"], ["formatted_sum_fees", "£3.30"], ["formatted_price", "£27.50"]]

Answer 2

你只需要在你从web scrape获得的数组上添加uniq方法，这将从该数组中获得uniq值，然后你可以轻松地在该数组上迭代到将值存储到数据库中。