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- #---
- # Excerpted from "Agile Web Development with Rails",
- # published by The Pragmatic Bookshelf.
- # Copyrights apply to this code. It may not be used to create training material,
- # courses, books, articles, and the like. Contact us if you are in doubt.
- # We make no guarantees that this code is fit for any purpose.
- # Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
- #---
- class Cart < ActiveRecord::Base
- has_many :line_items, dependent: :destroy
- def add_product(product_id)
- current_item = line_items.find_by(product_id: product_id)
- if current_item
- current_item.quantity += 1
- else
- current_item = line_items.build(product_id: product_id)
- end
- current_item
- end
- end
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