for Rails ActiveRecord Callbacks order check

post.rb

class Post < ActiveRecord::Base
  belongs_to :user
  attr_accessible :body, :title

  after_destroy :after_destroy

  private
  def after_destroy
    puts "Post after_destroy"
  end
end

user.rb

class User < ActiveRecord::Base
  has_many :posts, :dependent => :destroy
  attr_accessible :email, :name

  before_validation :before_validation
  after_validation :after_validation

  before_save :before_save
  around_save :around_save
  after_save :after_save

  before_create :before_create
  around_create :around_create
  after_create :after_create

  before_update :before_update
  around_update :around_update
  after_update :after_update

  before_destroy :before_destroy
  around_destroy :around_destroy
  after_destroy :after_destroy

  private
  def method_name
    caller.first[/`.*'/][1..-2]
  end
  def print_method
    puts caller.first[/`.*'/][1..-2]
  end
  def before_validation
    print_method
    # false
  end
  def after_validation
    print_method
    # raise 'RORLab Exception'
  end
  def before_save
    print_method
  end
  def around_save
    puts "start #{method_name}"
    yield
    puts "end #{method_name}"
  end
  def after_save
    print_method
  end
  def before_create
    print_method
  end
  def around_create
    puts "start #{method_name}"
    yield
    puts "end #{method_name}"
  end
  def after_create
    print_method
  end  
  def before_update
    print_method
  end  
  def around_update
    puts "start #{method_name}"
    yield
    puts "end #{method_name}"
  end
  def after_update
    print_method
  end  
  def before_destroy
    print_method
  end  
  def around_destroy
    puts "start #{method_name}"
    yield
    puts "end #{method_name}"
  end
  def after_destroy
    print_method
  end  
end

user_create_update_result.txt

irb(main):002:0> u = User.new
=> #<User id: nil, name: nil, email: nil, created_at: nil, updated_at: nil>
irb(main):003:0> u.save
   (0.1ms)  begin transaction
before_validation
after_validation
before_save
start around_save
before_create
start around_create
  SQL (0.6ms)  INSERT INTO "users" ("created_at", "email", "name", "updated_at") VALUES (?, ?, ?, ?)  [["created_at", Sat, 27 Apr 2013 02:27:38 UTC +00:00], ["email", nil], ["name", nil], ["updated_at", Sat, 27 Apr 2013 02:27:38 UTC +00:00]]
end around_create
after_create
end around_save
after_save
   (2.6ms)  commit transaction
=> true
irb(main):004:0> u.save
   (0.1ms)  begin transaction
before_validation
after_validation
before_save
start around_save
before_update
start around_update
end around_update
after_update
end around_save
after_save
   (0.1ms)  commit transaction
=> true
irb(main):005:0>

user_relation_result.txt

irb(main):006:0> u = User.first
  User Load (0.3ms)  SELECT "users".* FROM "users" LIMIT 1
=> #<User id: 5, name: nil, email: nil, created_at: "2013-04-26 16:17:07", updated_at: "2013-04-26 16:17:07">
irb(main):007:0> u.posts << Post.create
   (0.0ms)  begin transaction
  SQL (1.5ms)  INSERT INTO "posts" ("body", "created_at", "title", "updated_at", "user_id") VALUES (?, ?, ?, ?, ?)  [["body", nil], ["created_at", Sat, 27 Apr 2013 02:32:05 UTC +00:00], ["title", nil], ["updated_at", Sat, 27 Apr 2013 02:32:05 UTC +00:00], ["user_id", nil]]
   (1.1ms)  commit transaction
   (0.1ms)  begin transaction
   (0.4ms)  UPDATE "posts" SET "user_id" = 5, "updated_at" = '2013-04-27 02:32:05.122799' WHERE "posts"."id" = 4
   (0.7ms)  commit transaction
  Post Load (0.2ms)  SELECT "posts".* FROM "posts" WHERE "posts"."user_id" = 5
=> [#<Post id: 4, title: nil, body: nil, user_id: 5, created_at: "2013-04-27 02:32:05", updated_at: "2013-04-27 02:32:05">]
irb(main):008:0> u.destroy
   (0.1ms)  begin transaction
  SQL (0.5ms)  DELETE FROM "posts" WHERE "posts"."id" = ?  [["id", 4]]
Post after_destroy
before_destroy
start around_destroy
  SQL (0.2ms)  DELETE FROM "users" WHERE "users"."id" = ?  [["id", 5]]
end around_destroy
after_destroy
   (2.6ms)  commit transaction
=> #<User id: 5, name: nil, email: nil, created_at: "2013-04-26 16:17:07", updated_at: "2013-04-26 16:17:07">
irb(main):009:0>