Question

Hello I want to make simple shopping cart.
I am a beginner in programming. So please help.
I have items with prices and i want to sum up them (quantity equals to one).

veiw

<h1>Summ:<%= @items.total %></h1>

model

class Item < ActiveRecord::Base

  def total
      summ = 0
      @items.each do |item|
          summ += item.price
      end
  end

end

What is wrong. I have this error NoMethodError in Items#index

Answer 1

Rails defines an Enumerable::sum method that you can call. So your view can look like this:

<h1>Summ: <%= @items.sum(&:price) %></h1>

You could also add a total method to your Order (or whatever model you are using that has_many :items). Something along the lines of:

class Order < ActiveRecord::Base
  has_many :items

  def total
    items.sum(&:price)
  end
end

And then your view:

<h1><%= @order.total %></h1>