12.1 Iteration G1: Capturing an Order 11.4 Iteration F4: Hide an Empty Cart
Verify that yes, indeed, the product index is broken.
get /products
Showing /home/rubys/svn/rails4/Book/util/work-193/depot/app/views/layouts/application.html.erb where line #21 raised:
undefined method `line_items' for nil:NilClassExtracted source (around line #21):
18: <div id="side">
19: <!-- START_HIGHLIGHT -->
20: <!-- START:hidden_div -->
21: <%= hidden_div_if(@cart.line_items.empty?, :id => "cart") do %>
22: <%= render @cart %>
23: <% end %>
24: <!-- END:hidden_div -->
Rails.root: /home/rubys/svn/rails4/Book/util/work-193/depot
app/views/layouts/application.html.erb:21
app/controllers/products_controller.rb:7:in `index'/home/rubys/git/rails/activesupport/lib/active_support/whiny_nil.rb:48:in `method_missing'
/home/rubys/git/rails/actionpack/lib/action_view/template.rb:134:in `block in render'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_view/template.rb:126:in `render'
/home/rubys/git/rails/actionpack/lib/action_view/render/layouts.rb:84:in `_render_layout'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:61:in `block in _render_template'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:55:in `_render_template'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:25:in `render'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:114:in `_render_template'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:108:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/renderers.rb:47:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/compatibility.rb:55:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:101:in `render_to_string'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:92:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rendering.rb:17:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:39:in `block (2 levels) in render'
/home/rubys/git/rails/activesupport/lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
/home/rubys/git/rails/activesupport/lib/active_support/core_ext/benchmark.rb:5:in `ms'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:39:in `block in render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:77:in `cleanup_view_runtime'
/home/rubys/git/rails/activerecord/lib/active_record/railties/controller_runtime.rb:15:in `cleanup_view_runtime'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:38:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/implicit_render.rb:10:in `default_render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:258:in `block in retrieve_response_from_mimes'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:189:in `call'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:189:in `respond_to'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/base.rb:145:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rendering.rb:11:in `process_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:433:in `_run__534421887__process_action__830655539__callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:408:in `_run_process_action_callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:88:in `run_callbacks'
/home/rubys/git/rails/actionpack/lib/abstract_controller/callbacks.rb:17:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:29:in `block in process_action'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:28:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rescue.rb:8:in `process_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/base.rb:114:in `process'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:40:in `process'
/home/rubys/git/rails/actionpack/lib/action_controller/metal.rb:126:in `dispatch'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
/home/rubys/git/rails/actionpack/lib/action_controller/metal.rb:166:in `block in action'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:27:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:27:in `call'
rack-mount (0.6.3) lib/rack/mount/route_set.rb:148:in `block in call'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:89:in `block in recognize'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:66:in `optimized_each'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:88:in `recognize'
rack-mount (0.6.3) lib/rack/mount/route_set.rb:139:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:454:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/head.rb:14:in `call'
rack (1.1.0) lib/rack/methodoverride.rb:24:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/flash.rb:177:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb:106:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/cookies.rb:235:in `call'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:31:in `block in call'
/home/rubys/git/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:11:in `cache'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:30:in `call'
/home/rubys/git/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:365:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:46:in `block in call'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:414:in `_run_call_callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:88:in `run_callbacks'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:44:in `call'
rack (1.1.0) lib/rack/sendfile.rb:105:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:48:in `call'
/home/rubys/git/rails/railties/lib/rails/rack/logger.rb:14:in `call'
rack (1.1.0) lib/rack/runtime.rb:17:in `call'
/home/rubys/git/rails/activesupport/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.1.0) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:10:in `synchronize'
rack (1.1.0) lib/rack/lock.rb:11:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/static.rb:30:in `call'
/home/rubys/git/rails/railties/lib/rails/application.rb:145:in `call'
/home/rubys/git/rails/railties/lib/rails/application.rb:81:in `method_missing'
/home/rubys/git/rails/railties/lib/rails/rack/log_tailer.rb:15:in `call'
rack (1.1.0) lib/rack/content_length.rb:13:in `call'
rack (1.1.0) lib/rack/handler/webrick.rb:48:in `service'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'/home/rubys/git/rails/activesupport/lib/active_support/whiny_nil.rb:48:in `method_missing'
app/views/layouts/application.html.erb:21
/home/rubys/git/rails/actionpack/lib/action_view/template.rb:134:in `block in render'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_view/template.rb:126:in `render'
/home/rubys/git/rails/actionpack/lib/action_view/render/layouts.rb:84:in `_render_layout'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:61:in `block in _render_template'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:55:in `_render_template'
/home/rubys/git/rails/actionpack/lib/action_view/render/rendering.rb:25:in `render'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:114:in `_render_template'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:108:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/renderers.rb:47:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/compatibility.rb:55:in `render_to_body'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:101:in `render_to_string'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:92:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rendering.rb:17:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:39:in `block (2 levels) in render'
/home/rubys/git/rails/activesupport/lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/benchmark.rb:309:in `realtime'
/home/rubys/git/rails/activesupport/lib/active_support/core_ext/benchmark.rb:5:in `ms'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:39:in `block in render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:77:in `cleanup_view_runtime'
/home/rubys/git/rails/activerecord/lib/active_record/railties/controller_runtime.rb:15:in `cleanup_view_runtime'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:38:in `render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/implicit_render.rb:10:in `default_render'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:258:in `block in retrieve_response_from_mimes'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:189:in `call'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/mime_responds.rb:189:in `respond_to'
app/controllers/products_controller.rb:7:in `index'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/implicit_render.rb:4:in `send_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/base.rb:145:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rendering.rb:11:in `process_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/callbacks.rb:18:in `block in process_action'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:433:in `_run__534421887__process_action__830655539__callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:408:in `_run_process_action_callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:88:in `run_callbacks'
/home/rubys/git/rails/actionpack/lib/abstract_controller/callbacks.rb:17:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:29:in `block in process_action'
/home/rubys/git/rails/activesupport/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/home/rubys/git/rails/activesupport/lib/active_support/notifications.rb:48:in `instrument'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/instrumentation.rb:28:in `process_action'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rescue.rb:8:in `process_action'
/home/rubys/git/rails/actionpack/lib/abstract_controller/base.rb:114:in `process'
/home/rubys/git/rails/actionpack/lib/abstract_controller/rendering.rb:40:in `process'
/home/rubys/git/rails/actionpack/lib/action_controller/metal.rb:126:in `dispatch'
/home/rubys/git/rails/actionpack/lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
/home/rubys/git/rails/actionpack/lib/action_controller/metal.rb:166:in `block in action'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:27:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:27:in `call'
rack-mount (0.6.3) lib/rack/mount/route_set.rb:148:in `block in call'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:89:in `block in recognize'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:66:in `optimized_each'
rack-mount (0.6.3) lib/rack/mount/code_generation.rb:88:in `recognize'
rack-mount (0.6.3) lib/rack/mount/route_set.rb:139:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/routing/route_set.rb:454:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/head.rb:14:in `call'
rack (1.1.0) lib/rack/methodoverride.rb:24:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/params_parser.rb:21:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/flash.rb:177:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/session/abstract_store.rb:106:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/cookies.rb:235:in `call'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:31:in `block in call'
/home/rubys/git/rails/activerecord/lib/active_record/connection_adapters/abstract/query_cache.rb:28:in `cache'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:11:in `cache'
/home/rubys/git/rails/activerecord/lib/active_record/query_cache.rb:30:in `call'
/home/rubys/git/rails/activerecord/lib/active_record/connection_adapters/abstract/connection_pool.rb:365:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:46:in `block in call'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:414:in `_run_call_callbacks'
/home/rubys/git/rails/activesupport/lib/active_support/callbacks.rb:88:in `run_callbacks'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/callbacks.rb:44:in `call'
rack (1.1.0) lib/rack/sendfile.rb:105:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/show_exceptions.rb:48:in `call'
/home/rubys/git/rails/railties/lib/rails/rack/logger.rb:14:in `call'
rack (1.1.0) lib/rack/runtime.rb:17:in `call'
/home/rubys/git/rails/activesupport/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.1.0) lib/rack/lock.rb:11:in `block in call'
<internal:prelude>:10:in `synchronize'
rack (1.1.0) lib/rack/lock.rb:11:in `call'
/home/rubys/git/rails/actionpack/lib/action_dispatch/middleware/static.rb:30:in `call'
/home/rubys/git/rails/railties/lib/rails/application.rb:145:in `call'
/home/rubys/git/rails/railties/lib/rails/application.rb:81:in `method_missing'
/home/rubys/git/rails/railties/lib/rails/rack/log_tailer.rb:15:in `call'
rack (1.1.0) lib/rack/content_length.rb:13:in `call'
rack (1.1.0) lib/rack/handler/webrick.rb:48:in `service'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/home/rubys/.rvm/rubies/ruby-1.9.3-r28190/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'Parameters:
None
_csrf_token: "DfCf16ezcEptWQtFeKM9f1qZfgWaxpeYnmviGg0xoNk=" cart_id: 3 session_id: "ca3e815de157e98edd81f048b9ec890f"
GATEWAY_INTERFACE: "CGI/1.1"
HTTP_ACCEPT: "text/html"
HTTP_COOKIE: "_depot_session=BAh7CEkiD3Nlc3Npb25faWQGOgZFRiIlY2EzZTgxNWRlMTU3ZTk4ZWRkODFmMDQ4YjllYzg5MGZJIhBfY3NyZl90b2tlbgY7AEZJIjFEZkNmMTZlemNFcHRXUXRGZUtNOWYxcVpmZ1dheHBlWW5tdmlHZzB4b05rPQY7AEZJIgxjYXJ0X2lkBjsARmkI--1c8cea601a29d5cf0a8200eeceed8946e568b55e; path=/; HttpOnly"
HTTP_HOST: "localhost:3000"
HTTP_USER_AGENT: "Ruby"
HTTP_VERSION: "HTTP/1.1"
PATH_INFO: "/products"
QUERY_STRING: ""
REMOTE_ADDR: "127.0.0.1"
REMOTE_HOST: "localhost"
REQUEST_METHOD: "GET"
REQUEST_PATH: "/"
REQUEST_URI: "http://localhost:3000/products"
SCRIPT_NAME: ""
SERVER_NAME: "localhost"
SERVER_PORT: "3000"
SERVER_PROTOCOL: "HTTP/1.1"
SERVER_SOFTWARE: "WEBrick/1.3.1 (Ruby/1.9.3/2010-06-06)"
action_controller.instance: #<ProductsController:0x92c4aa8 @action_has_layout=true, @view_context_class=nil, @_headers={"Content-Type"=>"text/html"}, @_status=200, @_response=#<ActionDispatch::Response:0x92c49b8 @writer=#<Proc:0x92c48dc@/home/rubys/git/rails/actionpack/lib/action_dispatch/http/response.rb:44 (lambda)>, @block=nil, @length=0, @header={}, @status=200, @body=[], @cookie=[], @sending_file=false, @blank=false, @cache_control={}, @etag=nil, @request=#<ActionDispatch::Request:0x92c49cc @env={"GATEWAY_INTERFACE"=>"CGI/1.1", "PATH_INFO"=>"/products", "QUERY_STRING"=>"", "REMOTE_ADDR"=>"127.0.0.1", "REMOTE_HOST"=>"localhost", "REQUEST_METHOD"=>"GET", "REQUEST_URI"=>"http://localhost:3000/products", "SCRIPT_NAME"=>"", "SERVER_NAME"=>"localhost", "SERVER_PORT"=>"3000", "SERVER_PROTOCOL"=>"HTTP/1.1", "SERVER_SOFTWARE"=>"WEBrick/1.3.1 (Ruby/1.9.3/2010-06-06)", "HTTP_ACCEPT"=>"text/html", "HTTP_USER_AGENT"=>"Ruby", "HTTP_COOKIE"=>"_depot_session=BAh7CEkiD3Nlc3Npb25faWQGOgZFRiIlY2EzZTgxNWRlMTU3ZTk4ZWRkODFmMDQ4YjllYzg5MGZJIhBfY3NyZl90b2tlbgY7AEZJIjFEZkNmMTZlemNFcHRXUXRGZUtNOWYxcVpmZ1dheHBlWW5tdmlHZzB4b05rPQY7AEZJIgxjYXJ0X2lkBjsARmkI--1c8cea601a29d5cf0a8200eeceed8946e568b55e; 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rack.version: [1, 1]Headers:
None
Conditionally display the cart.
edit app/views/layouts/application.html.erb
<% if @cart %>
<%= hidden_div_if(@cart.line_items.empty?, :id => "cart") do %>
<%= render @cart %>
<% end %>
<% end %>
Update the redirect test.
edit test/functional/line_items_controller_test.rb
test "should create line_item" do
assert_difference('LineItem.count') do
post :create, :product_id => products(:ruby).id
end
assert_redirected_to store_path
end
Add an AJAX test.
edit test/functional/line_items_controller_test.rb
test "should create line_item via ajax" do
assert_difference('LineItem.count') do
xhr :post, :create, :product_id => products(:ruby).id
end
assert_response :success
assert_select 'tr#current_item', /Programming Ruby 1.9/
end
Run the tests again.
rake test
(in /home/rubys/svn/rails4/Book/util/work-193/depot)
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
........
Finished in 0.201825 seconds.
8 tests, 29 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 16868
Loaded suite /home/rubys/.rvm/gems/ruby-1.9.3-r28190%global/gems/rake-0.8.7/lib/rake/rake_test_loader
Started
........................
Finished in 0.682526 seconds.
24 tests, 40 assertions, 0 failures, 0 errors, 0 skips
Test run options: --seed 47134
Save our progress
git commit -a -m "AJAX"
Created commit 4c709a4: AJAX
3 files changed, 39 insertions(+), 4 deletions(-)
git tag iteration-g
12.1 Iteration G1: Capturing an Order 11.4 Iteration F4: Hide an Empty Cart