class Department < ActiveRecord::Base
  belongs_to :school
  has_many :department_members, :dependent => :destroy
  # apply_add_departments 不能关联删除 tidings表有关联
  has_many :apply_add_departments
  has_many :tidings, as: :container, dependent: :destroy
  attr_accessible :name, :school_id, :is_auth, :identifier, :is_delete
  scope :is_active, lambda{where(:is_delete => false)}
  scope :is_delete, lambda{where(:is_delete => true)}


  # 如果 identifier 字段存在就取identifier 否则取id
  def to_param
    self.identifier.present? ? identifier : id
  end
end