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Mark Daoust

2006-Jan-19 22:50 UTC

[Rails] Troubleshooting Depot App

Hello!  I am working my way through the Agile Web Development guide on 
RoR (the depot application).

I am a bit lost as to where to debug the following error.  The error is 
pasted below:


===============================================================================================
NameError in Store#add_to_cart

undefined local variable or method `product'' for LineItem:Class

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

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/base.rb:991:in
`method_missing''
#{RAILS_ROOT}/app/models/line_item.rb:7:in `for_product''
#{RAILS_ROOT}/app/models/cart.rb:11:in `add_product''
./script/../config/../app/controllers/store_controller.rb:10:in 
`add_to_cart''

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/base.rb:991:in
`method_missing''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:853:in
`perform_action_without_filters''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/filters.rb:332:in
`perform_action_without_benchmark''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:82:in
`perform_action''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in
`process_without_session_management_support''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in
`process''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in 
`dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in 
`handle_dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83: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:173:in `start_thread''
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
/usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in 
`dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in 
`require''
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in 
`require''
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
script/server:3

/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.13.2/lib/active_record/base.rb:991:in
`method_missing''
#{RAILS_ROOT}/app/models/line_item.rb:7:in `for_product''
#{RAILS_ROOT}/app/models/cart.rb:11:in `add_product''
./script/../config/../app/controllers/store_controller.rb:10:in 
`add_to_cart''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:853:in
`perform_action_without_filters''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/filters.rb:332:in
`perform_action_without_benchmark''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/benchmarking.rb:69:in
`perform_action_without_rescue''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/rescue.rb:82:in
`perform_action''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/base.rb:369:in
`process_without_session_management_support''
/usr/local/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/session_management.rb:116:in
`process''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in 
`dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:117:in 
`handle_dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:83: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:173:in `start_thread''
/usr/local/lib/ruby/1.8/webrick/server.rb:162:in `start_thread''
/usr/local/lib/ruby/1.8/webrick/server.rb:95:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:92:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:23:in `start''
/usr/local/lib/ruby/1.8/webrick/server.rb:82:in `start''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/webrick_server.rb:69:in 
`dispatch''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/servers/webrick.rb:59
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in 
`require''
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
/usr/local/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/commands/server.rb:28
/usr/local/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:21:in 
`require''
/usr/local/lib/ruby/gems/1.8/gems/activesupport-1.2.5/lib/active_support/dependencies.rb:214:in
`require''
script/server:3

Request

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

Show session dump

---
:cart: !ruby/object:Cart
  items: []

  total_price: 0.0
flash: !map:ActionController::Flash::FlashHash {}


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

===============================================================================================
So I am assuming that there is a problem with the variable
''product'',
but I am having trouble finding it.  I don''t want to bombard you with 
code, but any direction would be helpful.

-- 
Posted via http://www.ruby-forum.com/.

Mark Daoust

2006-Jan-19 23:08 UTC

head link

[Rails] Re: Troubleshooting Depot App

Update...

It seems the error is being found in this code:

class Cart

        attr_reader :items
        attr_reader :total_price

        def initialize
                @items = []
                @total_price = 0.0
        end
        def add_product(product)
                @items << LineItem.for_product(product)
                @total_price += product.price
        end
end


I don''t see why it is saying product is undefined.  Any ideas?

-- 
Posted via http://www.ruby-forum.com/.

Mark Daoust

2006-Jan-19 23:12 UTC

head link

[Rails] Re: Troubleshooting Depot App

Ok...found it.  Pluralized product in the wrong place.

Darn typos.

-- 
Posted via http://www.ruby-forum.com/.

Leon

2006-Jan-20 07:00 UTC

head link

[Rails] Re: Troubleshooting Depot App

You may also find this http://books.pragprog.com/titles/rails/errata
helpful. It''s an errata for the book and it helps me very much.

Leo

On 1/20/06, Mark Daoust <mark@site-reference.com>
wrote:> Ok...found it.  Pluralized product in the wrong place.
>
> Darn typos.
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails@lists.rubyonrails.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

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