# Problem saving object graphs **URL:** \ **Category:** Rails\ **Created:** [March 12, 2008, 5:00pm UTC](https://www.ruby-forum.com/t/problem-saving-object-graphs/131703 "2008-03-12T17:00:15Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![hardy](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/h/c5a1d2/32.png) [@hardy](https://www.ruby-forum.com/u/hardy)\ **Post date:** [March 12, 2008, 5:00pm UTC](https://www.ruby-forum.com/t/problem-saving-object-graphs/131703/1 "2008-03-12T17:00:15Z")
Morning (as appropriate) all! I’m having a problem with rails 2.0.1 and am hoping somebody here might be able to help me out. I’m building a flex/rubyamf/rails app, and I’m having trouble saving object graphs. Here’s an example. Model: Contest has\_many Prizes Model: Prize belongs\_to Contest has\_many Wins Model: Win belongs to Prize When I create my Contest, I am populating Prizes, however, I’m not populating Wins. When I get to ContestsController.create and do @contest.save it’s blowing up (stack below) because it doesn’t like that @contest.prizes.wins is nil. There are no validations on wins, and I really suspect I SHOULD be able to do this. Anybody have an idea what might be wrong? I know that my objects are good when they hit the controller, so it’s not rubyamf at this point. . .that was a whole other story ; ) Here are the params and dump: Parameters: {0=\>#\, “contest”=\>{“start\_date”=\>Mon Mar 03 00:00:00 -0600 2008, “rules\_url”=\>nil, “name”=\>“bbb”, “end\_date”=\>Sun Mar 09 00:00:00 -0600 2008, “contest\_bookmarks”=\>nil, “updated\_at”=\>nil, “premium”=\>false, “prizes”=\>[#\], “submitted\_by\_id”=\>nil, “company\_url”=\>nil, “contest\_category”=\>#\, “approved\_by”=\>nil, “comments”=\>nil, “attributes\_cache”=\>{}, “ratings”=\>nil, “notes”=\>nil, “approved”=\>false, “attributes”=\>{“start\_date”=\>Mon Mar 03 00:00:00 -0600 2008, “end\_date”=\>Sun Mar 09 00:00:00 -0600 2008, “rules\_url”=\>nil, “name”=\>“bbb”, “premium”=\>false, “updated\_at”=\>nil, “submitted\_by\_id”=\>nil, “company\_url”=\>nil, “notes”=\>nil, “approved”=\>false, “eligibility\_id”=\>1, “entry\_instructions”=\>nil, “frequency\_id”=\>1, “contest\_url”=\>nil, “recommended”=\>false, “approved\_by\_id”=\>nil, “approved\_at”=\>nil, “rules\_text”=\>nil, “admin\_notes”=\>nil, “contest\_category\_id”=\>1, “created\_at”=\>nil}, “eligibility\_id”=\>1, “eligibility”=\>#\, “entry\_instructions”=\>nil, “frequency\_id”=\>1, “contest\_url”=\>nil, “recommended”=\>false, “approved\_by\_id”=\>nil, “approved\_at”=\>nil, “submitted\_by”=\>nil, “rules\_text”=\>nil, “created\_at”=\>nil, “contest\_category\_id”=\>1, “admin\_notes”=\>nil, “frequency”=\>#\}, “action”=\>“create”, “controller”=\>“contests”} NoMethodError (undefined method `each' for #): /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ base.rb:1459:in`method\_missing’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ associations/association\_collection.rb:164:in `send' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations/association_collection.rb:164:in`method\_missing’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ base.rb:1620:in `with_scope' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations/association_collection.rb:164:in`send’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ associations/association\_collection.rb:164:in `method_missing' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations.rb:1067:in`validate\_associated\_records\_for\_wins’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:967:in `send' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ validations.rb:967:in`run\_validations’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:965:in `each' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ validations.rb:965:in`run\_validations’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:929:in `valid_without_callbacks?' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ callbacks.rb:273:in`valid?’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ associations.rb:1072:in `validate_associated_records_for_prizes' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations/association_proxy.rb:124:in`each’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ associations/association\_proxy.rb:124:in `send' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations/association_proxy.rb:124:in`method\_missing’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ associations/association\_collection.rb:162:in `method_missing' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ associations.rb:1067:in`validate\_associated\_records\_for\_prizes’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:967:in `send' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ validations.rb:967:in`run\_validations’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:965:in `each' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ validations.rb:965:in`run\_validations’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:929:in `valid_without_callbacks?' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ callbacks.rb:273:in`valid?’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ validations.rb:900:in `save_without_transactions' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ transactions.rb:108:in`save’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ connection\_adapters/abstract/database\_statements.rb:66:in `transaction' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ transactions.rb:80:in`transaction’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ transactions.rb:100:in `transaction' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ transactions.rb:108:in`save’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ transactions.rb:120:in `rollback_active_record_state!' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ transactions.rb:108:in`save’ /app/controllers/contests\_controller.rb:70:in `create' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ mime_responds.rb:106:in`call’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ mime\_responds.rb:106:in `respond_to' /app/controllers/contests_controller.rb:69:in`create’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ base.rb:1168:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ base.rb:1168:in`perform\_action\_without\_filters’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ filters.rb:697:in `call_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ filters.rb:689:in`perform\_action\_without\_benchmark’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/benchmark.rb:293:in`measure’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ rescue.rb:199:in`perform\_action\_without\_caching’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ caching.rb:678:in `perform_action' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ connection_adapters/abstract/query_cache.rb:33:in`cache’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ query\_cache.rb:8:in `cache' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ caching.rb:677:in`perform\_action’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ base.rb:524:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ base.rb:524:in`process\_without\_filters’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ filters.rb:685:in `process_without_session_management_support' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ session_management.rb:123:in`process’ /vendor/plugins/rubyamf/app/actions.rb:139:in `invoke' /vendor/plugins/rubyamf/app/actions.rb:86:in`run’ /vendor/plugins/rubyamf/app/filters.rb:53:in `run' /vendor/plugins/rubyamf/app/filters.rb:51:in`each’ /vendor/plugins/rubyamf/app/filters.rb:51:in `run' /vendor/plugins/rubyamf/app/filters.rb:49:in`upto’ /vendor/plugins/rubyamf/app/filters.rb:49:in `run' /vendor/plugins/rubyamf/app/filters.rb:11:in`run’ /vendor/plugins/rubyamf/app/filters.rb:10:in `each' /vendor/plugins/rubyamf/app/filters.rb:10:in`run’ /vendor/plugins/rubyamf/app/rails\_gateway.rb:28:in `service' /app/controllers/rubyamf_controller.rb:16:in`gateway’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ base.rb:1168:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ base.rb:1168:in`perform\_action\_without\_filters’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ filters.rb:697:in `call_filters' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ filters.rb:689:in`perform\_action\_without\_benchmark’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/benchmark.rb:293:in`measure’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ benchmarking.rb:68:in `perform_action_without_rescue' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ rescue.rb:199:in`perform\_action\_without\_caching’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ caching.rb:678:in `perform_action' /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active_record/ connection_adapters/abstract/query_cache.rb:33:in`cache’ /Library/Ruby/Gems/1.8/gems/activerecord-2.0.1/lib/active\_record/ query\_cache.rb:8:in `cache' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ caching.rb:677:in`perform\_action’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ base.rb:524:in `send' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ base.rb:524:in`process\_without\_filters’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ filters.rb:685:in `process_without_session_management_support' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ session_management.rb:123:in`process’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ base.rb:388:in `process' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ dispatcher.rb:171:in`handle\_request’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ dispatcher.rb:115:in `dispatch' /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action_controller/ dispatcher.rb:126:in`dispatch\_cgi’ /Library/Ruby/Gems/1.8/gems/actionpack-2.0.1/lib/action\_controller/ dispatcher.rb:9:in `dispatch' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:78:in`process’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:76:in `synchronize' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/rails.rb:76:in`process’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:618:in `process_client' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in`each’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:617:in `process_client' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in`run’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in `initialize' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in`new’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:736:in `run' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in`initialize’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in `new' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel.rb:720:in`run’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:271:in `run' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:270:in`each’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/configurator.rb:270:in `run' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:127:in`run’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/lib/mongrel/command.rb:211:in `run' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/gems/1.8/gems/mongrel-1.0.1/bin/mongrel_rails:243 /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active_support/ dependencies.rb:489:in`load’ /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active\_support/ dependencies.rb:489:in `load' /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active_support/ dependencies.rb:342:in`new\_constants\_in’ /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active\_support/ dependencies.rb:489:in `load' /Library/Ruby/Gems/1.8/gems/rails-2.0.1/lib/commands/servers/ mongrel.rb:64 /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/custom_require.rb:27:in`gem\_original\_require’ /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/custom\_require.rb:27:in `require' /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active_support/ dependencies.rb:496:in`require’ /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active\_support/ dependencies.rb:342:in `new_constants_in' /Library/Ruby/Gems/1.8/gems/activesupport-2.0.1/lib/active_support/ dependencies.rb:496:in`require’ /Library/Ruby/Gems/1.8/gems/rails-2.0.1/lib/commands/server.rb:39 /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/custom\_require.rb:27:in `gem_original_require' /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ ruby/1.8/rubygems/custom_require.rb:27:in`require’ script/server:3 Thanks all! H