Undefined local variable or method

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class ProdutItem
  attr_reader :item, :price_unit, :qtde

  def initialize(item, price_unit, qtde)
    @item = item
    @price_unit = price_unit
    @qtde = qtde
  end

  def calc_qtde
     (price_unit * qtde)
  end

end

 prod = ProdutItem.new("A", 0.50, 3)
 puts prod.calc_qtde

class CalcDiscount
  attr_reader :discount

  def initialize(discount)
    @discount = discount
  end

  def calc_desc
    (price_unit * qtde) - discount
  end
end

desc = CalcDiscount.new(0.20)
puts desc.calc_desc

When I run this my above code returns the following error msg:

teste_04.Rb:29:in calc_desc': undefined local variable or method price_unit' for # (Nameerror) from teste_04.Rb:34:in `'

Eu nao consigo identificar o erro. Alguem poderia me ajudar?
ruby

  • I believe you are not creating the variable : "calc_desc"

  • price_unit does not exist within the class CalcDiscount only in the ProdutItem and if it exists it must be accessed with @

  • Isac, even add the price_unit, continues with error: teste_04.Rb:24:in `initialize': Wrong number of Arguments (Given 1, expected 2) (Argumenterror)

1 answer

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I did it that way and it worked:

class ProdutItem
  attr_reader :item, :price_unit, :qtde

  def initialize(item, price_unit, qtde)
    @item = item
    @price_unit = price_unit
    @qtde = qtde
  end

  def calc_qtde
    (price_unit * qtde)
  end

end

class CalcDiscount
  attr_reader :discount

  def initialize(discount)
    @discount = discount
  end

  def calc_desc(product)
    (product.price_unit * product.qtde) - discount
  end
end


prod = ProdutItem.new("A", 0.50, 3)
puts prod.calc_qtde

desc = CalcDiscount.new(0.20)
puts desc.calc_desc(prod)

To calculate the discount, the method needs the unitary price and the quantity of the product. Because of this, I added the parameter product in the method that calculates the discount so that we can have access to information we want.

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