Hello! I am working my way through the Agile Web D. 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.