def generate_authentication_token
  loop do
    token = Devise.friendly_token
    hashed_token = BCrypt::Password.create(token)

    update_attribute(:token_id, Devise.friendly_token)
    final_token = "#{token_id}-#{token}"

    break { token: final_token, hashed_token: hashed_token } unless User.where(authentication_token: hashed_token).first
  end
end