Question

我是第一次尝试这个，我不确定我是否已经达到了我想要的目标。我通过屏幕刮取数据作为数组，并希望将它们放入哈希值。

我有一个带有列的模型：home_team和：away_team，并希望将通过屏幕抓取的数据发布到这些

我希望有人可以在rb文件中快速运行它

require 'open-uri'
require 'nokogiri'

FIXTURE_URL = "http://www.bbc.co.uk/sport/football/premier-league/fixtures"

doc = Nokogiri::HTML(open(FIXTURE_URL))
home_team = doc.css(".team-home.teams").map {|team| team.text.strip}
away_team = doc.css(".team-away.teams").map {|team| team.text.strip}
team_clean = Hash[:home_team => home_team, :away_team => away_team]
puts team_clean.inspect

并告知这是否实际上是一个哈希，因为它似乎是一个数组，因为我看不到输出的哈希名称。我会期待这样的事情

{"team_clean"=>[{:home_team => "Man Utd", "Chelsea", "Liverpool"}, 
          {:away_team => "Swansea", "Cardiff"}]}

任何帮助表示赞赏

Answer 1

你真的得到了哈希。但它看起来与你预期的不同。你希望Hash里面有哈希。

澄清一些例子：

hash = {}
hash.class
 => Hash 

hash = { home_team: [], away_team: [] }
hash.class
=> Hash
hash[:home_team].class
=> Array

hash = { hash: { home_team: [], away_team: [] } }  
hash.class
=> Hash
hash[:hash].class
=> Hash
hash[:hash][:home_team].class
=> Array

您所称的“哈希名称”永远不会“输出”。哈希基本上是一个具有不同索引的数组。为了澄清这一点：

hash = { 0 => "A", 1 => "B" }
array = ["A", "B"]
hash[0]
=> "A"
array[0]
=> "A"
hash[1]
=> "B"
array[1]
=> "B"

基本上使用Hash，您还可以通过显式定义键来定义，查找值的方式和位置，而数组始终使用数字索引存储它。

Answer 2

这是解决方案

team_clean = Hash[:team_clean => [Hash[:home_team => home_team,:away_team => away_team]]]

获取数组并转换为哈希Ruby

2 个答案: