class DeleteUselessOrgActivities < ActiveRecord::Migration
  def up
    OrgActivity.all.each do |act|
      if act.container_type == 'Course'
        if CourseActivity.where("course_act_type=? and course_act_id =? and course_id =?", act.org_act_type, act.org_act_id, act.container_id).count == 0
          act.destroy
        end
      else
        if act.container_type == 'Project' and ForgeActivity.where("forge_act_type=? and forge_act_id =? and project_id =?", act.org_act_type, act.org_act_id, act.container_id).count == 0
          act.destroy
        end
      end
    end
  end

  def down
  end
end