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My add book to cart in model

/ Published in: Rails
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  1.   def add(book)
  2.     cur_item = cart_items.find_by_book_id(book.id)
  3.     new_item = cart_items.new(:book_id => book.id, :price => book.price, :amount => 1)
  4.     cur_item ? (cur_item.amount += 1; cur_item.save) : cart_items << new_item
  5.   end

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