ActiveModel validations without persistence

registration.rb

# Adapted from http://yehudakatz.com/2010/01/10/activemodel-make-any-ruby-object-feel-like-activerecord/
#
# app/models/registration.rb
class Registration
  extend ActiveModel::Naming
  include ActiveModel::Conversion
  include ActiveModel::Validations

  # Other ActiveModel modules:
  # AttributeMethods: Makes it easy to add attributes that are set like table_name :foo
  # Callbacks: ActiveRecord-style lifecycle callbacks.
  # Dirty: Support for dirty tracking

  attr_accessor(
    :company_name,
    :email,
    :first_name,
    :last_name,
    :terms_of_service
  )

  with_options presence: true, length: { in: 2..20 } do |o|
    o.validates :company_name, :first_name, :last_name
  end

  validates :email, presence: true, email: true
  validates :terms_of_service, acceptance: true

  def register
    if valid?
      # Do something interesting here
      # - send notifications
      # - log events, etc.
    end
  end

  def persisted?
    false
  end
end