require "action_controller"
  ActionController::Base.class_eval do
    def self.need_role(*roles)
      roles.each do |role|
        eval(%Q(
        def need_#{role.to_s} 
        unless is_#{role.to_s}?
          flash[:alert] = "身份不对"
          redirect_to root_path and return
        end
        end
        ))
      end
    end

    def attachit(model,attach = :attach)
      unless params[model.to_sym][attach].blank?
        if params[:action] == 'update'
          old_attach = eval("@#{model}.#{attach.to_s}")
          unless old_attach.blank?
            id = BSON::ObjectId.from_string(old_attach['grid_id'])
            MongoGrid.grid.delete(id)
          end
        end
        attach=params[model.to_sym][attach]
        MongoGrid.uploadtogrid(attach,width: 300)
      end
    end

    def pageit
      params[:page] ||= 1   
      per_page = 10
      @num=per_page*(params[:page].to_i-1)
    end
  end