Rails - Feb 2012 - STI vs Delegation

Hi,

This is my recent project where is started to use STI for extend my Ad
model. I never before used STI and many people which i recently discuss
not recommended me to use this method.

1. What are the advantages and disadvanteges of STI and why i should use
delegation ??

2. And how in delegation i can separate validation like below?

Ride coordination board: Singe Table Inheritance
Database: ads
  :title
  :price
  :content
  :username
  :from
  :to
Model: regular AD
  :title
  :price
  :ad_content
  :username
Model: Ride AD
  :title
  :price
  :username
  ---
  :from
  :to


 STI:
  class Ad < ActiveRecord::Base
  validates_presence_of :name, :email, :price
  validates_presence_of :title, :ad_content, if: is_regular?
  validates_presence_of :from, :to, unless: is_regular?

  def is_regular?
    self.type.nil?
  end
  end

  class RideAd < Ad
  end

-- 
Posted via http://www.ruby-forum.com/.

-- 
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.