trustieforge/app/models/poll.rb

class Poll < ActiveRecord::Base
  #attr_accessible :closed_at, :polls_group_id, :polls_name, :polls_status, :polls_type, :published_at, :user_id
  include Redmine::SafeAttributes
  include ApplicationHelper

  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
  # 添加课程的poll动态
  has_many :acts, :class_name => 'Activity', :as => :act, :dependent => :destroy
  # 课程动态
  has_many :course_acts, :class_name => 'CourseActivity',:as =>:course_act ,:dependent => :destroy
  after_create :act_as_activity, :act_as_course_activity
  # 课程消息
  has_many :course_messages, :class_name =>'CourseMessage', :as => :course_message, :dependent => :destroy
  after_save :act_as_course_message, :act_as_activity, :act_as_course_activity
  after_update :update_activity
  acts_as_event :title => Proc.new {|o| "#{l(:label_course_poll)}: #{o.polls_name}" },
               :description => :polls_description,
               :datetime => :published_at,
               :author => :user,
               :url => Proc.new {|o| {:controller => 'poll', :action => 'show', :id => o.id}}

  acts_as_activity_provider :type => 'polls',
                            #:permission => :view_course_polls,
                            :find_options => {:select => "#{Poll.table_name}.*",
                                              :joins => "LEFT JOIN #{Course.table_name}  ON ( #{Poll.table_name}.polls_type='Course' AND #{Poll.table_name}.polls_status= 2 AND #{Poll.table_name}.polls_group_id = #{Course.table_name}.id )"},
                            :timestamp => "#{self.table_name}.published_at",
                            :author_key => :user_id

  def act_as_activity
     self.acts << Activity.new(:user_id => self.user_id)
  end

  #动态的更新
  def update_activity
    update_course_activity(self.class, self.id)
    update_user_activity(self.class, self.id)
    update_org_activity(self.class, self.id)
  end

  #课程动态公共表记录
  def act_as_course_activity
    if self.polls_type == "Course"
      if self.polls_status == 2 #问卷是发布状态
        self.course_acts << CourseActivity.new(:user_id => self.user_id,:course_id => self.polls_group_id)
      elsif self.polls_status == 1 #问卷是新建状态
        self.course_acts.destroy_all
      end
    end
  end

  # 发布问卷，出了发布者外，其他人都能收到消息通知
  def act_as_course_message
    if self.polls_type == "Course"
      if self.polls_status == 2 #问卷是发布状态
        Course.find(self.polls_group_id).members.each do |m|
          if m.user_id != self.user_id
            self.course_messages << CourseMessage.new(:user_id => m.user_id, :course_id => self.polls_group_id, :viewed => false)
          end
        end
      elsif self.polls_status == 1 #问卷是新建状态
        self.course_messages.destroy_all
      end
    end
  end

end