class Nonce
  def set_nonce
    return true if nonce.present? #Guard to prevent overwriting

    self.nonace = loop do
      random_str = SecureRandom.urlsafe_base64
      break random_str unless self.class.exists?(nonce: random_str)
    end
  end
end

class Nonce
  def set_nonce
    return true if nonce.present? #Guard to prevent overwriting

    begin
      self.nonce = SecureRandom.urlsafe_base64
    end while self.class.exists?(nonce: nonce)
  end
end

class SomeClass
  validates :nonce, presence: true, uniqueness: true

  before_validation :set_nonce

  private

  def set_nonce
    return true if nonce.present?

    self.nonace = loop do
      random_str = SecureRandom.urlsafe_base64
      break random_str unless self.class.exists?(nonce: random_str)
    end
  end
end

# frozen_string_literal: true

require 'rails_helper'

describe Nonce, type: :model do
  describe '#set_nonce' do
    it do
      nonce = Nonce.create!
      expect(nonce.nonce.size).to eq(8)
    end

    it do
      nonce = Nonce.new
      expect(nonce.nonce).to be_nil
      nonce.save!
      expect(nonce.nonce.size).to eq(8)
    end

    it do
      nonce = Nonce.create!
      nonce_str = nonce.nonce
      nonce.update!(updated_at: Time.current)
      expect(nonce.nonce).to eq(nonce_str)
    end
  end
end

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