pwd.rb

Warden::Strategies.add(:password) do
  def authenticate!
    service = UserLoginService.new(params['email'], params['password'])
    if service.authenticate?
      success!(service.user)
    else
      throw :warden
    end
  end
  
  def user_serialize(user)
    user.id
  end
  
  def user_deserialize(user_id)
    User.find(user_id)
  end
end