Ottiiさん

sonoです。ありがとうございます！
書き直してやってみたところ、先ほどのエラーは
出なくなりました。
お恥ずかしい・・。

しかしながら、次のエラーがでました・・。

NoMethodError in StoreController#add_to_cart

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.+
RAILS_ROOT: script/../config/..

Application Trace | Framework Trace | Full Trace
#{RAILS_ROOT}/app/models/cart.rb:12:in `add_product'
app/controllers/store_controller.rb:10:in `add_to_cart'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/base.rb:910:in
`send'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/base.rb:910:in
`perform_action_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/filters.rb:368:in
`perform_action_without_benchmark'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/benchmarking.rb:69:in
`measure'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/rescue.rb:82:in
`perform_action'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/base.rb:381:in
`send'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/base.rb:381:in
`process_without_filters'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/filters.rb:377:in
`process_without_session_management_support'
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.12.3/lib/action_controller/session_management.rb:117:in
`process'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/dispatcher.rb:38:in
`dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/webrick_server.rb:115:in
`handle_dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/webrick_server.rb:81:in
`service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/local/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/local/lib/ruby/1.8/webrick/server.rb:155:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:144:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:144:in `start_thread'
/usr/local/lib/ruby/1.8/webrick/server.rb:94:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:89:in `each'
/usr/local/lib/ruby/1.8/webrick/server.rb:89:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:79:in `start'
/usr/local/lib/ruby/1.8/webrick/server.rb:79:in `start'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/webrick_server.rb:67:in
`dispatch'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.1.4/lib/commands/server.rb:30
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`gem_original_require'
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:27:in
`require'
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.3.1/lib/active_support/dependencies.rb:147:in
`require'
script/server:3
Request

Parameters: {"id"=>"2"}

Show session dump

--- 
:cart: !ruby/object:Cart 
  items: 
    - !ruby/object:LineItem 
      attributes: 
        quantity: 1
        product_id: 2
        unit_price: 50.0
      new_record: true
      product: !ruby/object:Product 
        attributes: 
          image_url: http://a.jp/a.jpeg
          date_available: 2006-08-06 11:51:00
          price: "50.00"
          title: b
          id: "2"
          description: "あ"
    - !ruby/object:LineItem 
      attributes: 
        quantity: 1
        product_id: 2
        unit_price: 50.0
      new_record: true
      product: !ruby/object:Product 
        attributes: 
          image_url: http://a.jp/a.jpeg
          date_available: 2006-08-06 11:51:00
          price: "50.00"
          title: b
          id: "2"
          description: "あ"
    - !ruby/object:LineItem 
      attributes: 
        quantity: 1
        product_id: 2
        unit_price: 50.0
      new_record: true
      product: !ruby/object:Product 
        attributes: 
          image_url: http://a.jp/a.jpeg
          date_available: 2006-08-06 11:51:00
          price: "50.00"
          title: b
          id: "2"
          description: "あ"
  tital_price: 0.0
flash: !ruby/hash:ActionController::Flash::FlashHash {}
Response

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


セッションは動いてるみたいなのですが
何か定義し忘れてるみたい（？）です・・。


> 
> 署名消すの忘れてた。。。
> 見なかったことにしてくだされｏｒｚ

了解ですb

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