提取URL参数

gistfile1.rb

   # in routes.rb
   match 'items/*query' => 'items#index'

    if params[:query]
      hash = Hash.new
      query = params[:query].split('/')

      index = 0
      while index < query.length && query[index +1]
        hash[query[index]] = query[index + 1]
        index = index + 2
      end
    end