class Discipline < ApplicationRecord
  has_many :sub_disciplines, dependent: :destroy

  has_many :shixun_sub_disciplines, -> { where("shixun = 1") }, class_name: "SubDiscipline"
  has_many :subject_sub_disciplines, -> { where("subject = 1") }, class_name: "SubDiscipline"
  has_many :question_sub_disciplines, -> { where("question = 1") }, class_name: "SubDiscipline"

  validates_presence_of :name

end