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Rails 2.3.11 Creating a Model for a Form and Using ActiveRecord Validation

In Rails 3, you simply enable ActiveRecord modules to add validations for any model not supported by the database. I want to create a model for the form (for example, the ContactForm model) and enable ActiveRecord validations. But you cannot just enable ActiveRecord modules in Rails 2.3.11. Is there a way to accomplish the same behavior as Rails 3 in Rails 2.3.11?

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If you just want to use the virtual class as your proxy server for several models, this can help (for 2.3.x, 3.xx you can use ActiveModel for users, as mentioned earlier):

class Registration
  attr_accessor :profile, :other_ar_model, :unencrypted_pass, :unencrypted_pass_confirmation, :new_email
  attr_accessor :errors

  def initialize(*args)
    # Create an Errors object, which is required by validations and to use some view methods.
    @errors = ActiveRecord::Errors.new(self)
  end

  def save
    profile.save
    other_ar_model.save
  end
  def save!
    profile.save!
    other_ar_model.save!
  end

  def new_record?
    false
  end

  def update_attribute
  end
  include ActiveRecord::Validations
  validates_format_of :new_email, :with => /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i
  validates_presence_of :unencrypted_pass
  validates_confirmation_of :unencrypted_pass
end

Validations, , save save! , . , , .

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