卡在我的CLI中出现错误[]：Array的未定义方法“标题”ArrayNoMethodError

问题描述

让我以说我对Ruby真的很新作为开头。我正在尝试创建一个CLI，到目前为止，这是我得到的：

class Topspotifysongs::CLI

def start
  Topspotifysongs::Scraper.new
  get_song
end
def get_song
  input=gets.strip.to_i
  song = Topspotifysongs::Songs.get_song_details(input)
  puts "........................................................................"
  show_song_details(song)
  puts "........................................................................"
  puts "Would you like to show another song? (y/n)"
  repeat_or_done
end

def show_song_details(song)
    Topspotifysongs::Songs.get_song_details(song)
    puts "----------- #{song.title} by #{song.artist} -----------"
    puts ""
    puts "Ranking:           #{song.rank}"
    puts ""
    puts "Streams:           #{song.streams}"
    puts ""
    puts "Link to song:      #{song.spotify_url}"
    puts ""
    puts "---------------------------------------------------------------------"
end

这是我的歌曲文件：

class Topspotifysongs::Songs

  attr_accessor :title,:artist,:rank,:streams,:spotify_url

  @@all = []

  def initialize(title=nil,artist=nil,rank=nil,streams=nil,spotify_url=nil)
    @title = title
    @artist = artist
    @rank = rank
    @streams = streams
    @spotify_url = spotify_url
    @@all << self
  end
  
  def self.all
    @@all
  end

  def self.get_song_details(song)
    doc = Nokogiri::HTML(open("https://spotifycharts.com/regional"))
    doc.css("idk").collect do |x|
      title = x.css("td.chart-table-track.strong").text
      artist = x.css("td.chart-table-track.span").text
      rank = x.css("td.chart-table-position").text
      streams = x.css("td.chart-table-streams").text
      spotify_url = x.css("td.a.href").value
    end
  end
end

我确定还需要消除其他错误，但是这个错误困扰了我好几个小时，我的脑子才开始炸：

/home/z****/****/topspotifysongs/lib/topspotifysongs/cli.rb:25:in `show_song_details': undefined method `title' for []:Array (NoMethodError)``` 

解决方法

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