Html 如何为merb中的will_paginate添加自定义渲染器？

由于我需要以这种方式完成分页标记：

某页

我想将自定义渲染器添加到Merb应用程序。当我把代码

module SearchPagination
  class LinkRenderer < WillPaginate::ActionView::LinkRenderer
    protected
    def windowed_page_numbers
      inner_window = @options[:inner_window].to_i
      window_from = current_page
      window_to = current_page + inner_window

      # adjust upper limit if out of bounds
      window_to = total_pages if window_to > total_pages
      left = (window_from..window_to).to_a
      left << :gap if total_pages > window_to
      left
   end
 end

那么，如何以正确的方式连接这些东西呢

<%= will_paginate @channels, :renderer => SearchPagination::LinkRenderer %>

uninitialized constant Merb::InlineTemplates::SearchPagination - (NameError)