The Depot Application

The Depot Application

8.4 Iteration C3: Handling Errors 8.2 Iteration C1: Creating a Cart

8.3 Iteration C2: Creating a Smarter Cart

 
edit app/models/cart_item.rb
class CartItem
 
  attr_reader :product, :quantity
  
  def initialize(product)
    @product = product
    @quantity = 1
  end
  
  def increment_quantity
    @quantity += 1
  end
  
  def title
    @product.title
  end
  
  def price
    @product.price * @quantity
  end
end
edit app/models/cart.rb
  def add_product(product)
    current_item = @items.find {|item| item.product == product}
    if current_item
      current_item.increment_quantity
    else
      @items << CartItem.new(product)
    end
  end
edit app/views/store/add_to_cart.html.erb
<h2>Your Pragmatic Cart</h2>
<ul>
  <% for item in @cart.items %>
    <li><%= item.quantity %> &times; <%=h item.title %></li>
  <% end %>
</ul>
get /store/add_to_cart/2

NoMethodError in StoreController#add_to_cart 

undefined method `product' for #<Product:0x7fdcf1a74178>

RAILS_ROOT: /home/rubys/git/awdwr/edition3/work-23/depot

Application Trace | Framework Trace | Full Trace

Request

Parameters: 

{"id"=>"2"}

Show session dump

Response

Headers: 

{"Content-Type"=>"",
 "Cache-Control"=>"no-cache"}
rake db:sessions:clear
NOTE: Gem.source_index is deprecated, use Specification. It will be removed on or after 2011-11-01.
Gem.source_index called from /home/rubys/git/awdwr/edition3/work-23/depot/config/../vendor/rails/railties/lib/rails/gem_dependency.rb:21.
NOTE: Gem::SourceIndex#initialize is deprecated with no replacement. It will be removed on or after 2011-11-01.
Gem::SourceIndex#initialize called from /home/rubys/git/awdwr/edition3/work-23/depot/config/../vendor/rails/railties/lib/rails/vendor_gem_source_index.rb:100.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
NOTE: Gem::SourceIndex#add_spec is deprecated, use Specification.add_spec. It will be removed on or after 2011-11-01.
Gem::SourceIndex#add_spec called from /home/rubys/.rvm/rubies/ruby-1.8.7-p352/lib/ruby/site_ruby/1.8/rubygems/source_index.rb:91.
WARNING: 'require 'rake/rdoctask'' is deprecated.  Please use 'require 'rdoc/task' (in RDoc 2.4.2+)' instead.
    at /home/rubys/.rvm/gems/ruby-1.8.7-p352/gems/rake-0.9.2.2/lib/rake/rdoctask.rb

Restart the server.

get /store/add_to_cart/2

Your Pragmatic Cart

  • 1 × Pragmatic Project Automation
get /store/add_to_cart/2

Your Pragmatic Cart

  • 2 × Pragmatic Project Automation
get /store/add_to_cart/3

Your Pragmatic Cart

  • 2 × Pragmatic Project Automation
  • 1 × Pragmatic Version Control
get /store/add_to_cart/wibble

ActiveRecord::RecordNotFound in StoreController#add_to_cart 

Couldn't find Product with ID=wibble

RAILS_ROOT: /home/rubys/git/awdwr/edition3/work-23/depot

Application Trace | Framework Trace | Full Trace

Request

Parameters: 

{"id"=>"wibble"}

Show session dump

Response

Headers: 

{"Content-Type"=>"",
 "Cache-Control"=>"no-cache"}

8.4 Iteration C3: Handling Errors 8.2 Iteration C1: Creating a Cart