Rails(on rack) customize reqeust parameters raise error

Could you give us a little more information about what you did and which error message you got? That'd make it easier to fix the problem. ;)

Let's mark this one as incomplete until we get more info.

Error message:

Processing WelcomeController#index (for 127.0.0.1 at 2010-09-10 11:06:21) [GET]
Parameters: {"action"=>"index", "id"=>"[]", "controller"=>"welcome"} Completed in 457ms (View: 453, DB: 114) | 200 OK [http://localhost/?id=1&id=[]]
SQL (0.2ms) SET NAMES 'utf8' SQL (0.1ms) SET SQL_AUTO_IS_NULL=0 /!\ FAILSAFE /!\ Fri Sep 10 11:06:42 +0800 2010 Status: 500 Internal Server Error undefined method each_pair' for nil:NilClass

/rails/comemap/vendor/rails/activesupport/lib/active_support/whiny_nil.rb:52:in `method_missing'
/rails/comemap/vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb:46:in `update'
/rails/comemap/vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb:91:in `merge'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/request.rb:385:in `parameters'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/base.rb:1288:in `assign_shortcuts'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/base.rb:527:in `process_without_filters'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/filters.rb:606:in `process_without_compass'
/rails/comemap/vendor/gems/compass-0.10.3/lib/compass/app_integration/rails/actionpack2/action_controller.rb:7:in `process'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/rescue.rb:65:in `call_with_exception'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:90:in `dispatch'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:121:in `_call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:130:in `build_middleware_stack'
/rails/comemap/vendor/rails/activerecord/lib/active_record/query_cache.rb:29:in `call'
/rails/comemap/vendor/rails/activerecord/lib/active_record/query_cache.rb:29:in `call'
/rails/comemap/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
/rails/comemap/vendor/rails/activerecord/lib/active_record/query_cache.rb:9:in `cache'
/rails/comemap/vendor/rails/activerecord/lib/active_record/query_cache.rb:28:in `call'
/rails/comemap/vendor/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/haml-3.0.15/rails/../lib/sass/plugin/rack.rb:41:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/string_coercion.rb:25:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/head.rb:9:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/methodoverride.rb:24:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/params_parser.rb:15:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/session/cookie_store.rb:99:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/failsafe.rb:26:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/lock.rb:11:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/lock.rb:11:in `synchronize'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/lock.rb:11:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:114:in `call'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/reloader.rb:34:in `run'
/rails/comemap/vendor/rails/actionpack/lib/action_controller/dispatcher.rb:108:in `call'
/rails/comemap/vendor/rails/railties/lib/rails/rack/static.rb:31:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/urlmap.rb:47:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/urlmap.rb:41:in `each'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/urlmap.rb:41:in `call'
/rails/comemap/vendor/rails/railties/lib/rails/rack/log_tailer.rb:17:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/content_length.rb:13:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/chunked.rb:15:in `call'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/handler/mongrel.rb:67:in `process'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:159:in `process_client'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `each'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:158:in `process_client'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `initialize'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `new'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:285:in `run'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `initialize'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `new'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/mongrel-1.1.5/lib/mongrel.rb:268:in `run'
/Users/dev2x/.rvm/gems/ruby-1.8.7-p299/gems/rack-1.1.0/lib/rack/handler/mongrel.rb:38:in `run'
/rails/comemap/vendor/rails/railties/lib/commands/server.rb:111
/Users/dev2x/.rvm/rubies/ruby-1.8.7-p299/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/Users/dev2x/.rvm/rubies/ruby-1.8.7-p299/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
./script/server:3

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