Rails Model without a table

by 
class Model

  include ActiveModel::Validations
  include ActiveModel::Conversion
  extend ActiveModel::Naming

  attr_accessor :whatever

  validates :whatever, :presence => true

  def initialize(attributes = {})
    attributes.each do |name, value|
      send("#{name}=", value)
    end
  end

  def persisted?
    false
  end

end

attr_accessor will create your attributes and you will create the object with initialize() and set attributes.

The method persisted will tell there is no link with the database. You can find examples like this one:
http://railscasts.com/episodes/219-active-model?language=en&view=asciicast

Which will explain you the logic.

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