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# Ruby on Rails 2.1 - Callback Functions

During the life cycle of an active record object, you can hook into 8 events:

- (-) save
- (-) valid?
- (1) before_validation
- (2) before_validation_on_create
- (-) validate
- (-) validate_on_create
- (3) after_validation
- (4) after_validation_on_create
- (5) before_save
- (6) before_create
- (-) create
- (7) after_create
- (8) after_save

### Examples

    class Subscription < ActiveRecord::Base
      before_create :record_signup
    private
      def record_signup
        self.signed_up_on = Date.today
      end
    end
    class Firm < ActiveRecord::Base
     # Destroys the associated clients and
     # people when the firm is destroyed
     before_destroy{
        |record|Person.destroy_all "firm_id= #{record.id}"
     }
     before_destroy{
        |record|Client.destroy_all "client_of= #{record.id}"
     }
    end

Check the following link for more detail on Callback Functions.

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