another_cart

Yet another implementation for shopping cart, really simple and easy to use.

• Add gem "kart" to Gemfile
• Run bundle install

Make sure to create [User] and [Product] model beforehand

• rails generate cart [User] [Product]
  example: rails g cart Member Book will create a cart contains books selected by a member.
• rails db:migrate these files created by this command are self-explanatory.
• insert selecting :product to [User] and selected_by :user to [Product].

• selecting_products: list of products are selected by current user
• show_cart: list of product id and quantity in cart of current user
• add_to_cart (Product): add 1 product to cart
• remove_from_cart (Product): remove 1 product from cart
• remove_all_from_cart: remove all products from cart (when checking out successfully)
• add_multiple_to_cart (Product,number): add multiple products to cart

• Kart::UserNotDefined: insert selected_by into Product model
• Kart::ProductNotDefined: insert selecting into User model
• Kart::ItemNotFound: item need to be added to cart before removed