rails g scaffold Cart
finding a cart
rails g scaffold LineItem product:references cart:belongs_to
cart has_many line_tiems
product has_many line_items
ensure not referenced by any line_items before destroy product
add button for products on store index page
button display inline
fix the naming error for current_cart
include the CurrentCart module
set_cart before the create action
get the :product_id parameter from the request
build a new line item with the relationship
add some test on line_items controller
update the show page of cart
Merge pull request #4 from hxx/CartCreation

Cart creation