class Hack < ApplicationRecord
  # 编程题
  validates_length_of :name, maximum: 60
  # 测试集
  has_many :hack_sets, ->{order("position asc")}, :dependent => :destroy

  # 代码
  has_many :hack_codes, :dependent => :destroy

  def language
    if hack_codes.count == 1
      hack_codes.first.language
    else
      hack_codes.pluck(:language)
    end
  end

  def code
    if hack_codes.count == 1
      hack_codes.first.code
    else
      hack_codes.pluck(:code)
    end
  end

end