Rails 3.1 Callbacks

results.md

s = Test.new(:name => "foo")

# ActiveRecord::Test after_initialize
# ActiveRecord::Test after_initialize, :on => :update
# ActiveRecord::Test after_initialize, :on => :create
# ActiveRecord::TestObserver after_initialize

# ===> #<Test id: nil, name: "foo", created_at: nil, updated_at: nil>

s = Test.create(:name => "foo")

# ActiveRecord::Test after_initialize
# ActiveRecord::Test after_initialize, :on => :update
# ActiveRecord::Test after_initialize, :on => :create
# ActiveRecord::TestObserver after_initialize
# ActiveRecord::Test before_validation
# ActiveRecord::Test before_validation :on => :create
# ActiveRecord::TestObserver before_validation
# ActiveRecord::Test after_validation
# ActiveRecord::Test after_validation :on => :create
# ActiveRecord::TestObserver after_validation
# ActiveRecord::Test before_save :on => :update
# ActiveRecord::Test before_save :on => :create
# ActiveRecord::TestObserver before_save
# ActiveRecord::Test before_create
# ActiveRecord::Test after_create
# ActiveRecord::Test after_save :on => :update
# ActiveRecord::Test after_save :on => :create
# ActiveRecord::TestObserver after_save

# ===> #<Test id: 8, name: "foo", created_at: "2011-09-15 01:23:55", updated_at: "2011-09-15 01:23:55">

s.update_attribute(:name, "foo")

# ActiveRecord::Test before_save :on => :update
# ActiveRecord::Test before_save :on => :create
# ActiveRecord::TestObserver before_save
# ActiveRecord::Test before_update
# ActiveRecord::TestObserver before_update
# ActiveRecord::Test after_update
# ActiveRecord::TestObserver after_update
# ActiveRecord::Test after_save :on => :update
# ActiveRecord::Test after_save :on => :create
# ActiveRecord::TestObserver after_save

# ===> true

s.update_attributes(:name => "bar")

# ActiveRecord::Test before_validation
# ActiveRecord::Test before_validation, :on => :update
# ActiveRecord::TestObserver before_validation
# ActiveRecord::Test after_validation
# ActiveRecord::Test after_validation, :on => :update
# ActiveRecord::TestObserver after_validation
# ActiveRecord::Test before_save :on => :update
# ActiveRecord::Test before_save :on => :create
# ActiveRecord::TestObserver before_save
# ActiveRecord::Test before_update
# ActiveRecord::TestObserver before_update
# ActiveRecord::Test after_update
# ActiveRecord::TestObserver after_update
# ActiveRecord::Test after_save :on => :update
# ActiveRecord::Test after_save :on => :create
# ActiveRecord::TestObserver after_save

#   ===> true

s.save

# ActiveRecord::Test before_validation
# ActiveRecord::Test before_validation, :on => :update
# ActiveRecord::TestObserver before_validation
# ActiveRecord::Test after_validation
# ActiveRecord::Test after_validation, :on => :update
# ActiveRecord::TestObserver after_validation
# ActiveRecord::Test before_save :on => :update
# ActiveRecord::Test before_save :on => :create
# ActiveRecord::TestObserver before_save
# ActiveRecord::Test before_update
# ActiveRecord::TestObserver before_update
# ActiveRecord::Test after_update
# ActiveRecord::TestObserver after_update
# ActiveRecord::Test after_save :on => :update
# ActiveRecord::Test after_save :on => :create
# ActiveRecord::TestObserver after_save

# ===> true

test.rb

class Test < ActiveRecord::Base
  after_initialize :test_after_initialize

  after_initialize :test_after_initialize_on_update, :on => :update

  after_initialize :test_after_initialize_on_create, :on => :create

  before_validation :test_before_validation
  after_validation :test_after_validation

  before_validation :test_before_validation_on_update, :on => :update
  after_validation :test_after_validation_on_update, :on => :update

  before_validation :test_before_validation_on_create, :on => :create
  after_validation :test_after_validation_on_create, :on => :create

  before_update :test_before_update
  after_update :test_after_update

  before_create :test_before_create
  after_create :test_after_create

  before_save :test_before_save_on_update, :on => :update
  after_save :test_after_save_on_update, :on => :update

  before_save :test_before_save_on_create, :on => :create
  after_save :test_after_save_on_create, :on => :create

  def test_after_initialize
    puts "ActiveRecord::Test after_initialize"
  end

  def test_after_initialize_on_update
    puts "ActiveRecord::Test after_initialize, :on => :update"
  end

  def test_after_initialize_on_create
    puts "ActiveRecord::Test after_initialize, :on => :create"
  end

  def test_before_validation
    puts "ActiveRecord::Test before_validation"
  end

  def test_after_validation
    puts "ActiveRecord::Test after_validation"
  end

  def test_before_validation_on_update
    puts "ActiveRecord::Test before_validation, :on => :update"
  end

  def test_after_validation_on_update
    puts "ActiveRecord::Test after_validation, :on => :update"
  end

  def test_before_update
    puts "ActiveRecord::Test before_update"
  end

  def test_after_update
    puts "ActiveRecord::Test after_update"
  end

  def test_before_create
    puts "ActiveRecord::Test before_create"
  end

  def test_after_create
    puts "ActiveRecord::Test after_create"
  end

  def test_before_save_on_update
    puts "ActiveRecord::Test before_save :on => :update"
  end

  def test_after_save_on_update
    puts "ActiveRecord::Test after_save :on => :update"
  end

  def test_before_save_on_create
    puts "ActiveRecord::Test before_save :on => :create"
  end

  def test_after_save_on_create
    puts "ActiveRecord::Test after_save :on => :create"
  end

  def test_before_validation_on_create
    puts "ActiveRecord::Test before_validation :on => :create"
  end

  def test_after_validation_on_create
    puts "ActiveRecord::Test after_validation :on => :create"
  end
end

test_observer.rb

class TestObserver < ActiveRecord::TestObserver
  def after_initialize(section)
    puts "ActiveRecord::TestObserver after_initialize"
  end

  def before_save(section)
    puts "ActiveRecord::TestObserver before_save"
  end

  def after_save(section)
    puts "ActiveRecord::TestObserver after_save"
  end

  def before_update(section)
    puts "ActiveRecord::TestObserver before_update"
  end

  def after_update(section)
    puts "ActiveRecord::TestObserver after_update"
  end

  def before_validation(section)
    puts "ActiveRecord::TestObserver before_validation"
  end

  def after_validation(section)
    puts "ActiveRecord::TestObserver after_validation"
  end
end