2 files changed, 64 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/callbacks.rb b/activerecord/lib/active_record/callbacks.rb
index e2a8f03c8f..aecde5848c 100644
--- a/activerecord/lib/active_record/callbacks.rb
+++ b/activerecord/lib/active_record/callbacks.rb
@@ -9,7 +9,6 @@ module ActiveRecord
   # * (-) <tt>valid</tt>
   # * (1) <tt>before_validation</tt>
   # * (-) <tt>validate</tt>
-  # * (-) <tt>validate_on_create</tt>
   # * (2) <tt>after_validation</tt>
   # * (3) <tt>before_save</tt>
   # * (4) <tt>before_create</tt>
@@ -223,9 +222,10 @@ module ActiveRecord
 
       extend ActiveModel::Callbacks
 
+      define_callbacks :validation, :terminator => "result == false", :scope => [:kind, :name]
+
       define_model_callbacks :initialize, :find, :only => :after
       define_model_callbacks :save, :create, :update, :destroy
-      define_model_callbacks :validation, :only => [:before, :after]
     end
 
     module ClassMethods
@@ -236,6 +236,24 @@ module ActiveRecord
           send(meth.to_sym, meth.to_sym)
         end
       end
+
+      def before_validation(*args, &block)
+        options = args.last
+        if options.is_a?(Hash) && options[:on]
+          options[:if] = Array(options[:if])
+          options[:if] << "@_on_validate == :#{options[:on]}"
+        end
+        set_callback(:validation, :before, *args, &block)
+      end
+
+      def after_validation(*args, &block)
+        options = args.extract_options!
+        options[:prepend] = true
+        options[:if] = Array(options[:if])
+        options[:if] << "!halted && value != false"
+        options[:if] << "@_on_validate == :#{options[:on]}" if options[:on]
+        set_callback(:validation, :after, *(args << options), &block)
+      end
     end
 
     def create_or_update_with_callbacks #:nodoc:
diff --git a/activerecord/test/cases/callbacks_test.rb b/activerecord/test/cases/callbacks_test.rb
index 5a084a611e..ff2322ac15 100644
--- a/activerecord/test/cases/callbacks_test.rb
+++ b/activerecord/test/cases/callbacks_test.rb
@@ -113,6 +113,26 @@ class ImmutableMethodDeveloper < ActiveRecord::Base
   end
 end
 
+class OnCallbacksDeveloper < ActiveRecord::Base
+  set_table_name 'developers'
+
+  before_validation { history << :before_validation }
+  before_validation(:on => :create){ history << :before_validation_on_create }
+  before_validation(:on => :update){ history << :before_validation_on_update }
+
+  validate do
+    history << :validate
+  end
+
+  after_validation { history << :after_validation }
+  after_validation(:on => :create){ history << :after_validation_on_create }
+  after_validation(:on => :update){ history << :after_validation_on_update }
+
+  def history
+    @history ||= []
+  end
+end
+
 class CallbackCancellationDeveloper < ActiveRecord::Base
   set_table_name 'developers'
 
@@ -250,7 +270,18 @@ class CallbacksTest < ActiveRecord::TestCase
     ], david.history
   end
 
-  def test_save
+  def test_validate_on_create
+    david = OnCallbacksDeveloper.create('name' => 'David', 'salary' => 1000000)
+    assert_equal [
+      :before_validation,
+      :before_validation_on_create,
+      :validate,
+      :after_validation,
+      :after_validation_on_create
+    ], david.history
+  end
+
+  def test_update
     david = CallbackDeveloper.find(1)
     david.save
     assert_equal [
@@ -297,6 +328,18 @@ class CallbacksTest < ActiveRecord::TestCase
     ], david.history
   end
 
+  def test_validate_on_update
+    david = OnCallbacksDeveloper.find(1)
+    david.save
+    assert_equal [
+      :before_validation,
+      :before_validation_on_update,
+      :validate,
+      :after_validation,
+      :after_validation_on_update
+    ], david.history
+  end
+
   def test_destroy
     david = CallbackDeveloper.find(1)
     david.destroy