class PrincipalActivity < ActiveRecord::Base
  attr_accessible :principal_act_id, :principal_act_type, :principal_id, :user_id
  #虚拟关联
  belongs_to :principal_act ,:polymorphic => true
  belongs_to :user
  validates :user_id,presence: true
  validates :principal_id,presence: true
  validates :principal_act_id,presence: true
  validates :principal_act_type, presence: true
  has_many :user_acts, :class_name => 'UserAcivity',:as =>:act
  after_save :add_user_activity
  before_destroy :destroy_user_activity

  #在个人动态里面增加当前动态
  def add_user_activity
    user_activity = UserActivity.where("act_type = '#{self.principal_act_type.to_s}' and act_id = '#{self.principal_act_id}'").first
    if user_activity
      user_activity.save
    else
      user_activity = UserActivity.new
      user_activity.act_id = self.principal_act_id
      user_activity.act_type = self.principal_act_type
      user_activity.container_type = "Principal"
      user_activity.container_id = self.principal_id
      user_activity.user_id = self.user_id
      user_activity.save
    end
  end

  def destroy_user_activity
    user_activity = UserActivity.where("act_type = '#{self.principal_act_type.to_s}' and act_id = '#{self.principal_act_id}'")
    user_activity.destroy_all
  end
end