class HomeworkBank < ApplicationRecord
  # homework_type: 1：普通作业  2：编程作业（弃用） 3：分组作业  4：实训作业
  belongs_to :course_list
  belongs_to :homework_common, optional: true
  belongs_to :user

  has_many :attachments, as: :container, :dependent => :destroy
  has_many :homework_commons, dependent: :nullify

  scope :is_public, -> { where(is_public: true)}
  scope :myself, ->(user_id) { where(user_id: user_id)}

  validates :name, length: { maximum: 60, too_long: "不能超过60个字符" }
  validates :description, length: { maximum: 15000, too_long: "不能超过15000个字符" }
  validates :reference_answer, length: { maximum: 15000, too_long: "不能超过15000个字符" }
end