我得到以下信息：
Started DELETE "/comments/13115742" for 127.0.0.1 at 2012-11-26 14:37:32 -0800
ActionController::RoutingError (No route matches [DELETE] "/comments/13115742"):
但是'rake routes'清楚地显示了这条路线：
$ rake routes
comments POST /comments(.:format) comments#create {:id=>/0-9+/, :format=>/json|html/}
comment GET /comments/:id(.:format) comments#show {:id=>/0-9+/, :format=>/json|html/}
PUT /comments/:id(.:format) comments#update {:id=>/0-9+/, :format=>/json|html/}
DELETE /comments/:id(.:format) comments#destroy {:id=>/0-9+/, :format=>/json|html/}
而且 routes.rb 明确定义了路由：
resources :comments, :constraints => {:id => /0-9+/, :format => /json|html/}, :except => [:new, :index, :edit]
请注意，我有一个评论控制器，并且从控制台路由也不起作用：
Loading development environment (Rails 3.2.8)
irb(main):001:0> r = Rails.application.routes
=> #<ActionDispatch::Routing::RouteSet:0x007f9ae17b66e0>
irb(main):002:0> r.recognize_path "/comments/3"
ActionController::RoutingError: No route matches "/comments/3"
from /Users/nick/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/actionpack-3.2.8/lib/action_dispatch/routing/route_set.rb:633:in `recognize_path'
from (irb):2
from /Users/nick/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start'
from /Users/nick/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start'
from /Users/nick/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
irb(main):003:0> CommentsController.new()
=> #<CommentsController:0x007f9ae3f9d9b0 @_routes=nil, @_action_has_layout=true, @_headers={"Content-Type"=>"text/html"}, @_status=200, @_request=nil, @_response=nil>
有什么建议么？