app/models/api_key.rb

	api_key.rb revision 248ce7a27b1f8b0f557b2d7f05967084753c3bbb
class ApiKey < ActiveRecord::Base
  KEY_LENGTH = 48
  STATES = %w(valid invalid)

  belongs_to :user
  attr_accessible :key, :status
  attr_accessible :user

  before_validation :initialize_key

  validates :user, presence: true
  validates :key, presence: true, uniqueness: true
  validates :status, inclusion: {in: STATES}

  def self.create_new_key!(user)
    transaction do
      where(user_id: user, status: 'valid').
        find_each { |key| key.invalidate! }
      create!(user: user)
    end
  end

  def invalidate!
    self.status = 'invalid'
    save!
  end

  private
  def initialize_key
    generate_key! unless key
    set_status! unless status
    true
  end

  def generate_key!
    self.key = SecureRandom.hex(KEY_LENGTH)
  end

  def set_status!
    self.status = 'valid'
  end
end