A simple way to manage multiple parameters in Rails routing

application.rb

before_filter :hash_options

def hash_options
  params[:options] = Hash[*((params[:options].size % 2) == 0) ? params[:options] : (params[:options] + [nil])] if params[:options]
end

routes.rb

map.connect ':controller/:action/*options'

show.html.erb

<a href="/pages/show/<%= "user_name/#{@user_name}/date/#{@date}" %>">Link</a>