# NoMethodError : undefined method \`stringify\_keys!' for "2":String **URL:** \ **Category:** Rails\ **Created:** [September 25, 2009, 11:59am UTC](https://www.ruby-forum.com/t/nomethoderror-undefined-method-stringify-keys-for-2-string/176154 "2009-09-25T11:59:35Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![maddy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/838e76/32.png) [@maddy](https://www.ruby-forum.com/u/maddy)\ **Post date:** [September 25, 2009, 11:59am UTC](https://www.ruby-forum.com/t/nomethoderror-undefined-method-stringify-keys-for-2-string/176154/1 "2009-09-25T11:59:35Z")
Hi, I have been trying to create a small Rails application. In one of the steps, I am facing this error as “NoMethodError in ContactController#update … undefined method `stringify\_keys!’ for “2”:String”. Let me give a brief description of the application. This application is to Create, View and Update contacts. The problem came when updating a record. The “Update” action in controller file looks like this, ``` def update @contact = Contact.new(params[:id]) @contact.attributes = params[:contact] @contact.save! redirect_to :action => "index" end ``` Below is the complete error stack, * * * xxxxxxxxxxxxxxxx-------------------------------------------------- NoMethodError in ContactController#update undefined method `stringify\_keys!’ for “2”:String RAILS\_ROOT: D:/rails\_projects/contactlist Application Trace | Framework Trace | Full Trace D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active\_record/base.rb:2111:in `attributes=' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/base.rb:1926:in`initialize’ app/controllers/contact\_controller.rb:24:in `new' app/controllers/contact_controller.rb:24:in`update’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active\_record/base.rb:2111:in `attributes=' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/base.rb:1926:in`initialize’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:1158:in `send' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/base.rb:1158:in`perform\_action\_without\_filters’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/filters.rb:697:in `call_filters' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/filters.rb:689:in`perform\_action\_without\_benchmark’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/benchmarking.rb:68:in `perform_action_without_rescue' D:/RoR/ruby/lib/ruby/1.8/benchmark.rb:293:in`measure’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/benchmarking.rb:68:in `perform_action_without_rescue' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/rescue.rb:199:in`perform\_action\_without\_caching’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/caching.rb:678:in `perform_action' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/connection_adapters/abstract/query_cache.rb:33:in`cache’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active\_record/query\_cache.rb:8:in `cache' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/caching.rb:677:in`perform\_action’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:524:in `send' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/base.rb:524:in`process\_without\_filters’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/filters.rb:685:in `process_without_session_management_support' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/session_management.rb:123:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:388:in `process' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/dispatcher.rb:171:in`handle\_request’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/dispatcher.rb:115:in `dispatch' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/dispatcher.rb:126:in`dispatch\_cgi’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/dispatcher.rb:9:in `dispatch' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:76:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:74:in `synchronize' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:74:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:159:in `process_client' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:158:in`each’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:158:in `process_client' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in `initialize' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in`new’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in`initialize’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in `new' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:282:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:281:in`each’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:281:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/bin/ mongrel_rails:128:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/command.rb:212:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/bin/ mongrel_rails:281 D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:489:in`load’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:489:in `load' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:342:in`new\_constants\_in’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:489:in `load' D:/RoR/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/servers/ mongrel.rb:64 D:/RoR/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’ D:/RoR/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `require' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:496:in`require’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:342:in `new_constants_in' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:496:in`require’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/server.rb: 39 D:/RoR/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `gem_original_require' D:/RoR/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`require’ script/server:3 D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active\_record/base.rb:2111:in `attributes=' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/base.rb:1926:in`initialize’ app/controllers/contact\_controller.rb:24:in `new' app/controllers/contact_controller.rb:24:in`update’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:1158:in `send' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/base.rb:1158:in`perform\_action\_without\_filters’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/filters.rb:697:in `call_filters' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/filters.rb:689:in`perform\_action\_without\_benchmark’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/benchmarking.rb:68:in `perform_action_without_rescue' D:/RoR/ruby/lib/ruby/1.8/benchmark.rb:293:in`measure’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/benchmarking.rb:68:in `perform_action_without_rescue' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/rescue.rb:199:in`perform\_action\_without\_caching’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/caching.rb:678:in `perform_action' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active_record/connection_adapters/abstract/query_cache.rb:33:in`cache’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/ active\_record/query\_cache.rb:8:in `cache' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/caching.rb:677:in`perform\_action’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:524:in `send' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/base.rb:524:in`process\_without\_filters’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/filters.rb:685:in `process_without_session_management_support' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/session_management.rb:123:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/base.rb:388:in `process' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/dispatcher.rb:171:in`handle\_request’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/dispatcher.rb:115:in `dispatch' D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action_controller/dispatcher.rb:126:in`dispatch\_cgi’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/ action\_controller/dispatcher.rb:9:in `dispatch' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:76:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:74:in `synchronize' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/rails.rb:74:in`process’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:159:in `process_client' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:158:in`each’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:158:in `process_client' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in `initialize' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in`new’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:285:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in`initialize’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in `new' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel.rb:268:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:282:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:281:in`each’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/configurator.rb:281:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/bin/ mongrel_rails:128:in`run’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/lib/ mongrel/command.rb:212:in `run' D:/RoR/ruby/lib/ruby/gems/1.8/gems/mongrel-1.1.2-x86-mswin32/bin/ mongrel_rails:281 D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:489:in`load’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:489:in `load' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:342:in`new\_constants\_in’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:489:in `load' D:/RoR/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/servers/ mongrel.rb:64 D:/RoR/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’ D:/RoR/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `require' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:496:in`require’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active\_support/dependencies.rb:342:in `new_constants_in' D:/RoR/ruby/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/ active_support/dependencies.rb:496:in`require’ D:/RoR/ruby/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/server.rb: 39 D:/RoR/ruby/lib/ruby/site\_ruby/1.8/rubygems/custom\_require.rb:27:in `gem_original_require' D:/RoR/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in`require’ script/server:3 Request Parameters: {“commit”=\>“Update”, “authenticity\_token”=\>“9ebbca881cc0e31be50530d9b3f1a38fcf1a74d1”, “contact”=\>{“city”=\>“bangalo”, “country”=\>“India”, “phone”=\>“234122342”, “first\_name”=\>“abc”, “last\_name”=\>“def”, “address”=\>“weiwq, werwqqq, wer”, “state”=\>“KA”, “email”=\>“removed\_email\_address@domain.invalid”}, “id”=\>“2”} Show session dump * * * :csrf\_id: 5d52f51ba29b9131292e9e783e78f09b flash: !map:ActionController::Flash::FlashHash {} Response Headers: {“cookie”=\>[], “Cache-Control”=\>“no-cache”} * * * xxxxxxxxxxxxxxxxxxxxxxx---------------------------------------- What I feel is that there is something wrong with this statement in ‘Update’ action, @contact.attributes = params[:contact] I just don’t have enough command on this language to exactly know the problem. Can anyone help me solving this problem? Please do let me know if any additional details are needed. Many Thanks!! Maddy ---
**Author:** ![maddy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/838e76/32.png) [@maddy](https://www.ruby-forum.com/u/maddy)\ **Post date:** [September 25, 2009, 12:41pm UTC](https://www.ruby-forum.com/t/nomethoderror-undefined-method-stringify-keys-for-2-string/176154/2 "2009-09-25T12:41:53Z")
maddy wrote: > I think you are updating @contact @contact.update\_attributes(params[:contact]) ---
**Author:** ![maddy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/838e76/32.png) [@maddy](https://www.ruby-forum.com/u/maddy)\ **Post date:** [September 25, 2009, 1:01pm UTC](https://www.ruby-forum.com/t/nomethoderror-undefined-method-stringify-keys-for-2-string/176154/3 "2009-09-25T13:01:38Z")
On Sep 25, 10:57 am, maddy [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > The “Update” action in controller file looks like this, > > ``` > def update > @contact = Contact.new(params[:id]) > > ``` This should be Contact.find Fred ---
**Author:** ![maddy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/838e76/32.png) [@maddy](https://www.ruby-forum.com/u/maddy)\ **Post date:** [September 29, 2009, 10:32am UTC](https://www.ruby-forum.com/t/nomethoderror-undefined-method-stringify-keys-for-2-string/176154/4 "2009-09-29T10:32:55Z")
Hi Fred, Thanks a lot! You were right. It had to be Contact.find. Regards, maddy