Form object with error handling

signup.rb

class Signup
  include ActiveModel::Model

  attr_accessor :email, :team_name

  validates :email, presence: true
  validates :team_name, presence: true

  def save
    return false unless valid?

    user = User.new(email: email)
    team = Team.new(user: user, name: team_name)

    if user.save && team.save
      true
    else
      add_errors_from(user, team)
      false
    end
  end
end

# ActiveModel convenience monkeypatch
module ActiveModel::Validations::HelperMethods
  def add_errors_from(*objects)
    objects.compact.each do |object|
      object.errors.each do |name, message|
        self.errors.add(name, message)
      end
    end
  end
end