I think form me i should be something like this below because I need 
different validations to each type of ads. Or in your example could i set 
up this kind of different validations?
  

> class Ad < ActiveRecord::Base
>   validates_presence_of :name, :email, :price(?), :category_id(?)
>
>   :name
>   :phone_number
>   :email
>   :advertiser_id
>   :token
>   :verification_date 
>   :level
>   :category_id 
>   :admin_id 
>   :price 
>   :display_counter
>   :type 
> end
>

class RegularAd < Ad
>   validates_presence_of :title, :ad_content
>
>   :title
>   :ad_content
> end
>

class RideAd < Ad
>   validates_presence_of :from, :to
>
>   :from
>   :to
> end
>

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