Ruby on Rails: Fully functional tableless model

Question

After searching for a tableless model example I came across this code which seems to be the general consensus on how to create one.

class Item < ActiveRec         


        

Answer 1

I found an example at http://railscasts.com/episodes/219-active-model where I can use model features and then override static methods like all (should have thought of this before).

class Item
  include ActiveModel::Validations
  include ActiveModel::Conversion
  extend ActiveModel::Naming

  attr_accessor :name, :email, :content

  validates_presence_of :name
  validates_format_of :email, :with => /^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i
  validates_length_of :content, :maximum => 500

  class << self
    def all
      return []
    end
  end

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

  def persisted?
    false
  end
end

Answer 2

Or you could do it like this (Edge Rails only):

class Item
  include ActiveModel::Model

  attr_accessor :name, :email, :content

  validates_presence_of :name
  validates_format_of :email, :with => /^[-a-z0-9_+\.]+\@([-a-z0-9]+\.)+[a-z0-9]{2,4}$/i
  validates_length_of :content, :maximum => 500
end

By simply including ActiveModel::Model you get all the other modules included for you. It makes for a cleaner and more explicit representation (as in this is an ActiveModel)