will_paginate, paging_enumerator

http://errtheblog.com/posts/56-im-paginating-again
http://rock.errtheblog.com/will_paginate

PagingEnumerator 想要一次只取10筆的分頁作法
PagingEnumerator 自己去new

==controller==
 @items = NewsItem.find_all_news(order, 10, params[:page])

==model==
  def self.find_all_news(order, size, page)
    offset = ((page.to_i.nonzero? || 1) -1 )  * size
    total = NewsItem.count
    total = total > 10000 ? 10000 : total
    news = NewsItem.find(:all, :order => order, :limit => size, :offset => offset)
    PagingEnumerator.new(size, total, false, page, 1) do news end
  end