class Poll < ActiveRecord::Base
  #attr_accessible :closed_at, :polls_group_id, :polls_name, :polls_status, :polls_type, :published_at, :user_id
  include Redmine::SafeAttributes
  
  belongs_to :user
  has_many :poll_questions, :dependent => :destroy,:order => "#{PollQuestion.table_name}.question_number"
  has_many :poll_users, :dependent => :destroy
  has_many :users, :through => :poll_users #该文件被哪些用户提交答案过
end