没有从Ruby中的方法获得所需的返回

Question

在#play_song方法中，我需要显示#list_songs方法生成的歌曲列表。我没有在这里包含其他文件中的许多其他类，但到目前为止所有测试都已通过。 list_songs方法不会返回列表的外观：1。艺术家名称 - 歌曲名称 - 流派，2 ...

而是返回一个对象数组。我没有得到它，因为我的测试正在传递#list_songs，这要求歌曲以我刚刚描述的格式输出。那么为什么在play_song方法中调用#list_songs返回一个对象数组而不是将列表显示为1. 2 3 ...？

class MusicLibraryController
  extend Concerns::Findable
  attr_accessor :path

  def initialize(path = './db/mp3s')
    music_importer = MusicImporter.new(path)
    music_importer.import
  end

  def call
    response = nil
    until response == "exit" do
      puts "Welcome to your music library!"
      puts "To list all of your songs, enter 'list songs'."
      puts "To list all of the artists in your library, enter 'list artists'."
      puts "To list all of the genres in your library, enter 'list genres'."
      puts "To list all of the songs by a particular artist, enter 'list artist'."
      puts "To list all of the songs of a particular genre, enter 'list genre'."
      puts "To play a song, enter 'play song'."
      puts "To quit, type 'exit'."
      puts "What would you like to do?"
      response = gets
    end
  end

  def list_songs
    #"1. Thundercat - For Love I Come - dance" order by song name
    ordered_songs = Song.all.uniq.sort_by {|song| song.name} #need to use "uniq" because there are duplicates of each song for some reason
    ordered_songs.each do |song|
      number = ordered_songs.index(song) + 1
      puts  "#{number}. #{song.artist.name} - #{song.name} - #{song.genre.name}"
    end
  end

  def list_artists
    ordered_artists = Artist.all.sort_by {|artist| artist.name}
    ordered_artists.each do |artist|
      number = ordered_artists.index(artist) + 1
      puts "#{number}. #{artist.name}"
    end
  end

  def list_genres
    ordered_genres = Genre.all.sort_by {|genre| genre.name}
    ordered_genres.each do |genre|
      number = ordered_genres.index(genre) + 1
      puts "#{number}. #{genre.name}"
    end
  end

  def list_songs_by_artist
    puts "Please enter the name of an artist:"
    artist_name = gets
    artist = Artist.all.select { |artist| artist.name == artist_name }.first #need to use .first b/c there are duplicates of each object and we want to select only one object
    if artist != nil
      ordered_songs = artist.songs.sort_by {|song| song.name}
      i = 1
      ordered_songs.each do |song|
        puts "#{i}. #{song.name} - #{song.genre.name}"
        i += 1
      end
    end
  end

  def list_songs_by_genre
    puts "Please enter the name of a genre:"
    genre_name = gets
    genre = Genre.all.select { |genre| genre.name == genre_name }.first
    if genre != nil
      ordered_songs = genre.songs.sort_by {|song| song.name}
      i = 1
      ordered_songs.each do |song|
        puts "#{i}. #{song.artist.name} - #{song.name}"
        i += 1
      end
    end
  end
  binding.pry


  def play_song
    list_songs
    puts "Which song number would you like to play?"
  end
end