Agile Web Development with Rails, Edition 4

10.3 Iteration E3: Finishing the Cart 10.1 Iteration E1: Creating a Smarter Cart

10.2 Iteration E2: Handling Errors

<(?-mix:Unpermitted parameters?: cart_id)> expected but was
<  rescue_from ActiveRecord::RecordNotFound, with: :invalid_cart>.
<0> expected to be
>=
<1>.

Traceback:
  /home/rubys/git/awdwr/edition4/checkdepot.rb:174:in `block in <class:DepotTest>'

Log errors and show them on the screen.

Rescue error: log, flash, and redirect.

edit app/controllers/carts_controller.rb
class CartsController < ApplicationController
  before_action :set_cart, only: [:show, :edit, :update, :destroy]
  rescue_from ActiveRecord::RecordNotFound, with: :invalid_cart
  # GET /carts
  # ...
  private
  # ...
 
    def invalid_cart
      logger.error "Attempt to access invalid cart #{params[:id]}"
      redirect_to store_url, notice: 'Invalid cart'
    end
end

Reproduce the error.

get /carts/wibble
You are being redirected. 
get http://localhost:3000/

Invalid cart

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Inspect the log.

tail -25 log/development.log
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/_markup.html.erb (0.3ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.2ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.2ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.2ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/console.js.erb within layouts/javascript (10.5ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/main.js.erb within layouts/javascript (0.2ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.3ms)
  Rendered /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/templates/index.html.erb (21.8ms)
 
 
Started GET "/carts/wibble" for 127.0.0.1 at 2015-03-30 06:45:27 -0400
Processing by CartsController#show as HTML
  Parameters: {"id"=>"wibble"}
  Cart Load (0.1ms)  SELECT  "carts".* FROM "carts" WHERE "carts"."id" = ? LIMIT 1  [["id", 0]]
Attempt to access invalid cart wibble
Redirected to http://localhost:3000/
Completed 302 Found in 4ms (ActiveRecord: 0.4ms)
 
 
Started GET "/" for 127.0.0.1 at 2015-03-30 06:45:27 -0400
Processing by StoreController#index as HTML
  Product Load (0.2ms)  SELECT  "products".* FROM "products" ORDER BY "products"."updated_at" DESC LIMIT 1
  Product Load (0.1ms)  SELECT "products".* FROM "products" ORDER BY "products"."title" ASC
  Rendered store/index.html.erb within layouts/application (6.5ms)
Completed 200 OK in 61ms (Views: 58.7ms | ActiveRecord: 0.4ms)

Limit access to product_id

edit app/controllers/line_items_controller.rb
    # Never trust parameters from the scary internet, only allow the white
    # list through.
    def line_item_params
      params.require(:line_item).permit(:product_id)
    end
rake test:controllers
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from rescue in <class:Exception> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/integration/cruby.rb:37)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from block in <top (required)> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/extensions.rb:18)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from included at /home/rubys/.rvm/gems/ruby-head-n50123/gems/turbolinks-2.5.3/lib/turbolinks/xhr_url_for.rb:7)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from rescue in <class:Exception> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/integration/cruby.rb:37)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from block in <top (required)> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/extensions.rb:18)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from included at /home/rubys/.rvm/gems/ruby-head-n50123/gems/turbolinks-2.5.3/lib/turbolinks/xhr_url_for.rb:7)
rake aborted!
SyntaxError: /home/rubys/git/awdwr/edition4/work-220/depot/test/controllers/line_items_controller_test.rb:25: syntax error, unexpected keyword_end, expecting '}'
/home/rubys/git/awdwr/edition4/work-220/depot/test/controllers/line_items_controller_test.rb:55: syntax error, unexpected end-of-input, expecting keyword_end
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `require'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `block in require'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:240:in `load_dependency'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `require'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:118:in `block in run_tests'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:117:in `each'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:117:in `run_tests'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:88:in `run'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:82:in `run'
/home/rubys/git/rails/railties/lib/rails/test_unit/testing.rake:26:in `block (3 levels) in <top (required)>'
Tasks: TOP => test:controllers
(See full trace by running task with --trace)

Inspect the log.

grep -B 8 -A 7 "Unpermitted parameter" log/test.log
edit test/controllers/line_items_controller_test.rb
  test "should update line_item" do
    patch :update, params: { id: @line_item, line_item: { product_id: @line_item.product_id } }
    assert_redirected_to line_item_path(assigns(:line_item))
  end
rake log:clear LOGS=test
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from rescue in <class:Exception> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/integration/cruby.rb:37)
rake test:controllers
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from rescue in <class:Exception> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/integration/cruby.rb:37)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from block in <top (required)> at /home/rubys/.rvm/gems/ruby-head-n50123/gems/web-console-2.1.2/lib/web_console/extensions.rb:18)
DEPRECATION WARNING: alias_method_chain is deprecated. Please, use Module#prepend instead. From module, you can access the original method using super. (called from included at /home/rubys/.rvm/gems/ruby-head-n50123/gems/turbolinks-2.5.3/lib/turbolinks/xhr_url_for.rb:7)
rake aborted!
SyntaxError: /home/rubys/git/awdwr/edition4/work-220/depot/test/controllers/line_items_controller_test.rb:25: syntax error, unexpected keyword_end, expecting '}'
/home/rubys/git/awdwr/edition4/work-220/depot/test/controllers/line_items_controller_test.rb:59: syntax error, unexpected end-of-input, expecting keyword_end
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `require'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `block in require'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:240:in `load_dependency'
/home/rubys/git/rails/activesupport/lib/active_support/dependencies.rb:274:in `require'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:118:in `block in run_tests'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:117:in `each'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:117:in `run_tests'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:88:in `run'
/home/rubys/git/rails/railties/lib/rails/test_unit/runner.rb:82:in `run'
/home/rubys/git/rails/railties/lib/rails/test_unit/testing.rake:26:in `block (3 levels) in <top (required)>'
Tasks: TOP => test:controllers
(See full trace by running task with --trace)
grep "Unpermitted parameters" log/test.log | wc -l
0

10.3 Iteration E3: Finishing the Cart 10.1 Iteration E1: Creating a Smarter Cart