Ruby, stack level too deep (SystemStackError)

Question

I have the following code:

class BookPrice
  attr_accessor :price
  def initialize(price)
    @price = price
  end

  def price_in_cents
    Integer(price*100 +          


        

Answer 1

Your below code

def price
  @price = price # <~~ method name you just defined with `def` keyword.
end

Creates never stopable recursion,.

How can I make this code work the way it is without attr_accessor?

You need to write as

def price=(price)
  @price = price
end
def price
  @price 
end

Answer 2

One general reason this can happen is if you have some method that calls itself recursively (i.e. calls itself inside itself, which causes an infinite loop).

That's the problem I had that led to the error message.

In your case that's what's happening here:

def price
  @price = price
end

Answer 3

read_attribute is what you are looking for

def price 
  @price = read_attribute(:price)
end

Answer 4

You need to do:

@price = self.price

to differentiate between your object attribute price and your method parameter price.