How to use ActiveRecord Callbacks in Rails by Jay November 12, 2012 < 1 Minute ReadCallbacks are a great technique for achieving simplicity and flexibility. A callback allows you to run some code (usually a method) automatically when another piece of code runs. In Rails, you’ll commonly see callbacks that run before, after or even around other bits of code. Callback functions are minimizing the length of codes in controllers. Implementing Callbacks There are four types of callbacks accepted by the callback macros: Method references (symbol) Callback objects Inline methods (using a proc) Inline eval methods (using a string) – deprecated Here is the list of some useful callback functions while saving AcriveRecord objects before_save after_save before_save: This method is called before an ActiveRecord object is saved. class Post < ActiveRecord::Base before_save :update_slug protected def update_slug self[:slug] = [year, season_slug, season_type_slug].compact.join '/' end end after_save: Once the active record object saved some method will be fired in that scenario we have to use the after_save callback. class Post < ActiveRecord::Base after_save :handle_status_changed protected def handle_status_changed Setting.create(:post_id=>self.id , :status => true) end end Related Posts: Module in Ruby and its Usages in ‘Rails’ Rails 5 – Most Effective Features for Apps Upgradation The Best practices for Rails App Development Tags: Rails, RoR Jayadev Das email@example.com Do what you do best in – that’s what I’ve always believed in and that’s what I preach. Over the past 25+ years (yup that’s my expertise ‘n’ experience in the Information Technology domain), I’ve been consulting to small, medium and large companies ‘bout Web Technologies, Mobile Future as well as on the good-and-bad of tech. Blogger, International Business Advisor, Web Technology Expert, Sales Guru, Startup Mentor, Insurance Sales Portal Expert & a Tennis Player. And top of all – a complete family man!