Perfect Number

perfect.rb

class Perfection  
  def self.instance
    @instance ||= Perfection.new
  end

  def is_perfect(candidate)
    ret_val = false
    divisors = get_divisors(candidate)
    sum = 0
    
    divisors.each do |number|
      sum += number
    end
    
    ret_val = true if sum == candidate
    
    ret_val
  end

  def get_divisors(candidate)
    divisors = []

    1.upto(candidate - 1) do |i|
      foo = candidate / i
      if (foo*i) == candidate
        divisors << i
      end
    end
    divisors
  end

end

print "Introduce a number to see if is perfect: "
n = gets.chomp
n = n.to_i
puts "The number #{n} Perfection.instance.is_perfect(n)