Mongoid Callback Sequence

gistfile1.rb

require 'rubygems'
require 'bundler/setup'
require 'mongoid'

Mongoid.configure do |config|
  config.master = Mongo::Connection.new('localhost', 27017, :logger => nil).db('mongoid-test') 
end

class A
  include Mongoid::Document
  field :a
  before_save   { p 'before_save' }
  before_update { p 'before_update' }
  before_create { p 'before_create' }
  after_save    { p 'after_save' }
  after_update  { p 'after_update' }
  after_create  { p 'after_create' }
  around_save   { |&b| p 'start around_save';   b.call; p 'end around_save' }
  around_create { |&b| p 'start around_create'; b.call; p 'end around_create' }
  around_update { |&b| p 'start around_update'; b.call; p 'end around_update' }
end

a = A.new
a.save
#=> "before_save"
#=> "start around_save"
#=> "before_create"
#=> "start around_create"
#=> "end around_create"
#=> "after_create"
#=> "end around_save"
#=> "after_save"

a.a = 1
a.save
#=> "before_save"
#=> "start around_save"
#=> "before_update"
#=> "start around_update"
#=> "end around_update"
#=> "after_update"
#=> "end around_save"
#=> "after_save"

wondering where before_validation fits into this.

Same thought here as @omouse