class ExerciseChoice < ApplicationRecord

  belongs_to :exercise_question
  has_many :exercise_answers
  has_many :exercise_standard_answers

  scope :find_choice_custom, lambda {|k,v| where("#{k} = ?",v)}  #根据传入的参数查找问题
  scope :left_choice_choose, lambda {|k,v| where("#{k} > ?",v)}  #根据传入的参数查找问题

  after_destroy :destroy_choices_relations

  def destroy_choices_relations
    exercise_answers.destroy_all
    exercise_standard_answers.destroy_all
  end
end