Question

我试图让一个方法启动另一个类的多个实例。

class Players
  def initialize(players)
    @players = players
  end
  def generate_boards
    @players.each do |player|
      board = BingoBoardGenerator.new
      player = BingoBoard.new(player, board.generate)
      p player
    end
  end
end

players = ["Nick","Jiyoon","Mae","Lawson","Matthew"]
plays = Players.new(players)
plays.generate_boards

p player显示正确创建了五个BingoBoard个实例，但我不确定如何访问它们（或它们的位置）。有关如何调用这些实例的任何帮助？通常我会这样做：

nick = BingoBoard.new("Nick", board.generate) 
nick.board

但是当我将它们全部实例化时，我不知道如何设置/访问它们的实例名称。

Answer 1

如user2864740所示，您可以使用:map代替:each来返回BingoBoard个实例的数组。如果要存储这些实例以便稍后使用，可以使用memoization，如下所示。第一次调用:bingo_board_instances时，将生成电路板并设置实例变量@bingo_board_instances，以便将来调用:bingo_board_instances不会导致生成新电路板。

class Players
  def initialize(players)
    @players = players
  end

  def generate_boards
    @players.map do |player|
      board = BingoBoardGenerator.new
      BingoBoard.new(player, board.generate)
    end
  end

  def bingo_board_instances
    @bingo_board_instances ||= generate_boards
  end
end

虽然上面的代码运行得很好，但我认为更直观的解决方案是拥有Player类（而不是Players），然后传入Player个实例的数组初始化BingoBoardGenerator时。通过这种方法，您可以为每个单独的玩家设置一个实例变量，并创建一个属于该玩家的独特棋盘：

class BingoBoardGenerator

  def initialize(args)
    #dynamically set instance vars to handle n number of players
    args.fetch(:players).each_with_index do |player,index|
      instance_variable_set("@player_#{index+1}",player)
    end
  end

  def generate_boards
    instance_variables.map do |player|
      player = instance_variable_get(instance_var)
      #you will need to implement :generate_bingo_board on player...I would suggest using memoization so you can store the player's board for later retrieval
      player.generate_bingo_board
    end
  end
end

#I have no idea what your implementation looks like...
b = BingoBoardGenerator.new(players: [Player.new("Jen"),Player.new("Phil"),Player.new("Mary"),Player.new("Bert")])

b.generate_boards

这将允许您更好地封装可能属于各个玩家的数据，包括向每个Player实例询问其:board的能力。

使用方法生成另一个类

1 个答案: