>
> def add_product(product_id)
> current_item = line_items.where(:product_id => product_id).first
>
> if current_item
> current_item.quantity = current_item.quantity.to_i + 1
> else
> current_item = LineItem.new(:product_id=>product_id)
> line_items << current_item
Ok, let's imagine. You add new LineItem and product.price is nil or
quantity is nil
then
product.price * quantity
would raise error "nil can't be coerced into…"
Check if product price or quantity is nil after initialize LineItem.new
> end
> current_item
> end
>
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