A problem about routing request

Nanyang Zhan wrote:

Zhao Yi wrote:

You have a nil object when you didn't expect it!
The error occurred while evaluating nil.to_sym

贴出错误信息全文好查一点.

The error track is shown below.

/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route.rb:145:in
`extra_keys'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route.rb:145:in
`map'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route.rb:145:in
`extra_keys'
generated code
(/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route.rb:45):3:in
`generate'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/routing/route_set.rb:338:in
`generate'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/url_rewriter.rb:131:in
`rewrite_path'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/url_rewriter.rb:110:in
`rewrite_url'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/url_rewriter.rb:88:in
`rewrite'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_controller/base.rb:622:in
`url_for'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_view/helpers/url_helper.rb:71:in
`send'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-2.1.2/lib/action_view/helpers/url_helper.rb:71:in
`url_for'
(eval):17:in `ddts_path'
app/views/ddts/index.html.erb:15:in
`_run_erb_47app47views47ddts47index46html46erb'
app/views/ddts/index.html.erb:10:in `each'
app/views/ddts/index.html.erb:10:in
`_run_erb_47app47views47ddts47index46html46erb'
app/controllers/ddts_controller.rb:7:in `index'