根据 Ruby 中对象数组的用户输入输出正确的对象属性

Question

我使用包含所有类别名称、获奖者和提名者的文本文件创建了一个对象数组，其中包含有关奥斯卡奖的信息（获奖者也出现在提名者列表中）。我现在希望能够询问用户。您想知道哪个类别的获胜者？一旦提出问题，它将返回答案。我只能让它在数组的最后一个对象上工作（最佳视觉效果返回重力）。有人可以解释为什么会这样吗？

class AwardCategory 
  attr_accessor :winner, :name, :nominees
  def initialize(name)
    @name = name
    @nominees = []
  end
end 

class Nominee
  attr_accessor :name
  def initialize(name)
    @name = name 
  end
end 

file = File.open('oscar_noms.txt', 'r')

oscars = []
begin
  while true do
    award_category = AwardCategory.new(file.readline.downcase)
    award_category.winner = file.readline.downcase

    nominee = Nominee.new(file.readline.downcase)
    award_category.nominees << nominee

    next_nominee = Nominee.new(file.readline.downcase)
    until next_nominee.name == "\n"
      award_category.nominees << next_nominee
      next_nominee = Nominee.new(file.readline.downcase)
    end
    oscars << award_category
  end
rescue EOFError => e
  puts 'rescued'
end

#puts oscars.inspect

#Read input here
puts "What category do you want to know the winner for?"
  answer = gets
  oscars.each 
  if answer.downcase == award_category.name
    puts award_category.winner
  else
    puts "That is not a category"
    end

Answer 1

那段代码

puts "What category do you want to know the winner for?"
  answer = gets
  oscars.each 
  if answer.downcase == award_category.name
    puts award_category.winner
  else
    puts "That is not a category"
    end

现在有正确的缩进

puts "What category do you want to know the winner for?"
answer = gets
oscars.each 
if answer.downcase == award_category.name
  puts award_category.winner
else
  puts "That is not a category"
end

注意oscars.each 下面的部分没有缩进，因为each 需要一个do/end 块，它将为每个元素执行一次。你可能想要的是这个

puts "What category do you want to know the winner for?"
answer = gets
oscars.each do |award_category|
  if answer.downcase == award_category.name
    puts award_category.winner
  else
    puts "That is not a category"
  end
end

虽然我建议您不要使用其他选项，因为对于每个不匹配的答案，您都会收到 "That is not a category" 消息。此外，您应该使用gets.chomp 从用户输入中删除换行符，并在each 循环之外执行downcase。最后一点，您的一些变量命名不当。例如，为什么奖项类别列表应命名为oscars？它应该是award_categories。