help with "undefined method `stringify_keys!'" please

rubyonrails-talk
1

This is probably some dumb mistake on my part, but I'm not seeing it.

I have a _simple_ app that I'm playing with. In this scenario I have a meeting that I want to add agenda items to. When I click the submit button in this form I get a "stringify keys" error.

I'd appreciate it if someone could point out my error. What tools/practices do you use to trouble shoot these kinds of problems?

the error ======================================================= (enter "New Agenda Item" in the text box) the error =======================================================

NoMethodError in MeetingsController#addagendaitem

undefined method `stringify_keys!' for "New Agenda Item":String

RAILS_ROOT: ./script/../config/.. Application Trace | Framework Trace | Full Trace

C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1506:in `attributes=' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1354:in `initialize_without_callbacks' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/callbacks.rb:236:in `initialize' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `new' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `build' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/association_collection.rb:88:in `create' #{RAILS_ROOT}/app/controllers/meetings_controller.rb:23:in `addagendaitem' -e:4:in `load' -e:4

C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1506:in `attributes=' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1354:in `initialize_without_callbacks' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/callbacks.rb:236:in `initialize' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `new' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `build' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/association_collection.rb:88:in `create' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `send' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `perform_action_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in `perform_action_without_benchmark' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue' C:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in `perform_action' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `send' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `process_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in `process_without_session_management_support' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in `process' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in `handle_dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' C:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' C:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require' script/server:3

C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1506:in `attributes=' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/base.rb:1354:in `initialize_without_callbacks' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/callbacks.rb:236:in `initialize' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `new' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/has_many_association.rb:14:in `build' C:/ruby/lib/ruby/gems/1.8/gems/activerecord-1.14.4/lib/active_record/associations/association_collection.rb:88:in `create' #{RAILS_ROOT}/app/controllers/meetings_controller.rb:23:in `addagendaitem' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `send' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:941:in `perform_action_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:368:in `perform_action_without_benchmark' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue' C:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/benchmarking.rb:69:in `perform_action_without_rescue' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/rescue.rb:82:in `perform_action' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `send' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/base.rb:408:in `process_without_filters' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/filters.rb:377:in `process_without_session_management_support' C:/ruby/lib/ruby/gems/1.8/gems/actionpack-1.12.5/lib/action_controller/session_management.rb:117:in `process' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/dispatcher.rb:38:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:115:in `handle_dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:81:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:104:in `service' C:/ruby/lib/ruby/1.8/webrick/httpserver.rb:65:in `run' C:/ruby/lib/ruby/1.8/webrick/server.rb:173:in `start_thread' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:162:in `start_thread' C:/ruby/lib/ruby/1.8/webrick/server.rb:95:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `each' C:/ruby/lib/ruby/1.8/webrick/server.rb:92:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:23:in `start' C:/ruby/lib/ruby/1.8/webrick/server.rb:82:in `start' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/webrick_server.rb:67:in `dispatch' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/servers/webrick.rb:59 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require' C:/ruby/lib/ruby/gems/1.8/gems/rails-1.1.6/lib/commands/server.rb:30 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in `require' C:/ruby/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in `require' script/server:3 -e:4:in `load' -e:4

Request

Parameters: {"name"=>"New Agenda Item", "commit"=>"Add agenda item", "id"=>"1"}

Show session dump

2

Hi.

in the addagendaitem method, you try to create a new object (create method) while transfering just a string to it (params[:name]).

create expects to get an attributes hash and to stringify it's keys for the column names. i suggest you expand your code into more lines and create a new item, setting it's values and then saving.

you can also make your form in a way in which it will send an hash as the object (ex. "item" => { "name"=> "kof", "amount" => "2"}) this will enable you for doing Example.create(params[:item])

Hope this helps.

3

Thanks,

breaking it out into separate calls (create, initialize, save, add to meeting) works.

The coding pattern I used was based on what I saw in the "15 minute blog in Rails" video. I must have missed a concept there somehow. I'll have to experiment and see if I can get a better bearing on this.