help with "undefined method `stringify_keys!'" please

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Joe at CodeGear

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Dec 23, 2006, 12:06:41 PM12/23/06
to Ruby on Rails: Talk
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

---
:user: 1
:return_to:
flash: !map:ActionController::Flash::FlashHash {}


Response
Headers: {"cookie"=>[], "Cache-Control"=>"no-cache"}

from meetings_controller.rb =========================================
...
def addagendaitem
Meeting.find(params[:id]).agenda_items.create(params[:name])
end
...


show.rhtml in views/meetings ========================================
<h1>Run a Meeting</h1>

<%= render :partial => "run_meeting" %>

<h2>Agenda Items</h2>
<% for agenda_item in @meeting.agenda_items %>
<%= agenda_item.name %>
<% end %>

<hr>

<%= form_tag :action => "addagendaitem", :id => @meeting %>
<p>
<label for="name">Agenda Item:</label>
<br/>
<%= text_field_tag "name" %>
</p>

<p>
<%= submit_tag 'Add agenda item' %>

</p>

<%= end_form_tag %>

Elad Meidar - Creopolis.com

unread,
Dec 23, 2006, 1:45:07 PM12/23/06
to Ruby on Rails: Talk
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.

Joe at CodeGear

unread,
Dec 23, 2006, 11:28:45 PM12/23/06
to Ruby on Rails: Talk
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.

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