Agile Web Development with Rails 5, 1st Edition

Iteration D2: Connecting Products to Carts

We’re looking at sessions because we need somewhere to keep our shopping cart. We’ll cover sessions in more depth in ​Rails Sessions​, but for now let’s move on to implement the cart.

Let’s keep things simple. A cart contains a set of products. Based on the Initial guess at application data diagram, combined with a brief chat with our customer, we can now generate the Rails models and populate the migrations to create the corresponding tables:

depot> bin/rails generate scaffold LineItem product:references cart:belongs_to
 ...
depot> bin/rails db:migrate
==  CreateLineItems: migrating ================================================
-- create_table(:line_items) ...