aardbei/app/models/session.rb

class Session < ApplicationRecord
  belongs_to :user

  def Session.new_token
    SecureRandom.urlsafe_base64
  end

  def Session.digest(string)
    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
                                                  BCrypt::Engine.cost
    BCrypt::Password.create(string, cost: cost)
  end
end