acts as ferret & will_paginate

首先在你的environment.rb或lib目录下的某文件中添加

module ActsAsFerret
  module ClassMethods
    alias :find_all_by_contents :find_by_contents
    alias :find_all_multi_search :multi_search
  end
end

然后在你的controller中

@query = sanitize(params[:query])

page = params[:page].to_i.zero? ? 1 : params[:page].to_i

@users = User.paginate_by_contents(@query, :total_entries => User.total_hits(@query), :page => page, :per_page => 10)

对已知Array paginate

def search

......

  ids = User.find(....).collect { |u| u.id }

  users = User.find_by_contents(@query, {:limit=>:all}, {:conditions=>["id in (#{ids.join(',')})"]})

......

   @users = users.paginate(page, per_page)     

end