我的一个脚手架 controller：mycontroller
match '/q/:query', :to => 'mycontroller#show'
我想在 show 方法中使用到 params[:query]，但是 rails 报错，什么原因？
wrong number of arguments (1 for 0)
ArgumentError in CustomSearchEnginesController#show
wrong number of arguments (1 for 0) Rails.root: D:/startup/cse.so
Application Trace | Framework Trace | Full Trace
actionpack (3.2.5) lib/action_controller/metal.rb:143:in params'
app/controllers/custom_search_engines_controller.rb:18:inshow'
actionpack (3.2.5) lib/action_controller/metal/implicit_render.rb:4:in send_action'
actionpack (3.2.5) lib/abstract_controller/base.rb:167:inprocess_action'
actionpack (3.2.5) lib/action_controller/metal/rendering.rb:10:in process_action'
actionpack (3.2.5) lib/abstract_controller/callbacks.rb:18:inblock in process_action'
activesupport (3.2.5) lib/active_support/callbacks.rb:414:in `run866169062process_action950889305_callbacks'