File: model.rb

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class Model

  class Item
    attr_reader :name, :price
    def initialize(name,price)
      @name = name
      @price = price
    end
  end

  attr_reader :items

  def initialize
    @items = []
  end

  def amount
    val = 0
    items.each { |i| val += i.price }
    return val
  end

  def add_item(name,price)
    @items.push Item.new(name,price)
  end

  def del_item(name)
    @items.delete_if {|i| i.name == name }
  end

  def reset
    @items = []
  end

end