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Ruby on Rails - Callback Functions


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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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