Ruby OOP：是什么导致游戏对象中出现 NameError？

Question

我正在使用 Ruby 学习 OOP。我有 2 个课程 - 游戏和玩家。 将为井字游戏创建玩家和计算机。我的想法是使用 Player 类来创建游戏的玩家和计算机。

我相信 Player 类可以与 Game 类交互，因此 Game 类用

@player

初始化。游戏类应该能够打印出

player_name

，但是，它并没有按照我的计划发生。

class Game
    attr_accessor :player, :computer

    @@board = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

    def initialize(player, computer)
        @player = player
        @computer = computer

        puts "#{player.name} vs #{computer.name}"
    end

    def self.player_name
        puts "#{player.name}" # line 14
    end

    def self.computer_name
        puts "#{computer.name}"
    end

    def self.status
        puts "#{@@board}"
    end
end

class Player
    attr_reader :name

    def initialize(name)
        @name = name

        puts "#{name} is online."
    end
end

我执行以下代码：

p1 = Player.new('John')
p2 = Player.new('Computer')
Game.new(p1, p2)
Game.player_name # line 39
Game.computer_name

收到以下错误消息。错误来自第 39 行和第 14 行。

John is online.
Computer is online.
John vs Computer
test.rb:14:in `player_name': undefined local variable or method `player' for Game:Class (NameError)

        puts "#{player.name}"
                ^^^^^^
Did you mean?  player_name
        from test.rb:39:in `<main>'

我真的很困惑我的错误在哪里。

Answer 1

您将实例变量/方法与类变量/方法混合在一起。

将类变量转换为实例变量：

class Game
  attr_accessor :player, :computer

  def initialize(player, computer)
    @player = player
    @computer = computer
  end

  def player_name
    puts "#{player.name}"
  end

  def computer_name
    puts "#{computer.name}"
  end
end

并相应地称呼他们：

game = Game.new(p1, p2)
game.player_name
game.computer_name