class EcYear < ActiveRecord::Base
  default_scope :order => 'year desc'
  validates_uniqueness_of :year, :scope => :ec_major_school_id

  belongs_to :ec_major_school

  # 学生列表
  has_many :ec_year_students, :dependent => :destroy

  # 毕业要求
  has_many :ec_graduation_requirements, :dependent => :destroy

  # 培养目标
  has_one :ec_training_objective, :dependent => :destroy

  # 课堂配置
  has_many :ec_courses, :dependent => :destroy
  acts_as_attachable

  def prev_year
    ec_major_school.ec_years.find_by_year(year - 1)
  end
end