ActiveRecord callback execution sequence..

 Given below are the sequence of executions of

ActiveRecord callbacks.

Its handy when you have to execute particular piece of code at

particular time of record creation.

For before_persisting callback 

 before_persisting
  persist
  after_persisting
  [save record if record.changed?]
  

For befor_validation callback
  before_validation
  before_validation_on_create
  before_validation_on_update

validate
  after_validation_on_update
  after_validation_on_create
  after_validation
  [save record if record.changed?]

For before_create and before_update callback

before_save

before_create

before_update

saves the record

after_update

after_create

after_save
  [save record if record.changed?]
  

For before_destory callback
  before_destroy
  [save record if record.changed?]
  destroy
  after_destroy