3 files changed, 38 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/validations/associated.rb b/activerecord/lib/active_record/validations/associated.rb
index 6e6f4df415..66b78682ad 100644
--- a/activerecord/lib/active_record/validations/associated.rb
+++ b/activerecord/lib/active_record/validations/associated.rb
@@ -2,7 +2,7 @@ module ActiveRecord
   module Validations
     class AssociatedValidator < ActiveModel::EachValidator
       def validate_each(record, attribute, value)
-        return if (value.is_a?(Array) ? value : [value]).compact.all?{ |r| r.valid? }
+        return if (value.is_a?(Array) ? value : [value]).collect{ |r| r.nil? || r.valid? }.all?
         record.errors.add(attribute, :invalid, :default => options[:message], :value => value)
       end
     end
diff --git a/activerecord/test/cases/helper.rb b/activerecord/test/cases/helper.rb
index 307320b964..243c05e665 100644
--- a/activerecord/test/cases/helper.rb
+++ b/activerecord/test/cases/helper.rb
@@ -62,9 +62,10 @@ unless ENV['FIXTURE_DEBUG']
   end
 end
 
+require "cases/validations_repair_helper"
 class ActiveSupport::TestCase
   include ActiveRecord::TestFixtures
-  include ActiveModel::ValidationsRepairHelper
+  include ActiveRecord::ValidationsRepairHelper
 
   self.fixture_path = FIXTURES_ROOT
   self.use_instantiated_fixtures  = false
diff --git a/activerecord/test/cases/validations_repair_helper.rb b/activerecord/test/cases/validations_repair_helper.rb
new file mode 100644
index 0000000000..e04738d209
--- /dev/null
+++ b/activerecord/test/cases/validations_repair_helper.rb
@@ -0,0 +1,35 @@
+module ActiveRecord
+  module ValidationsRepairHelper
+    extend ActiveSupport::Concern
+
+    module ClassMethods
+      def repair_validations(*model_classes)
+        setup do
+          @_stored_callbacks = {}
+          model_classes.each do |k|
+            @_stored_callbacks[k] = k._validate_callbacks.dup
+          end
+        end
+        teardown do
+          model_classes.each do |k|
+            k._validate_callbacks = @_stored_callbacks[k]
+            k.__update_callbacks(:validate)
+          end
+        end
+      end
+    end
+
+    def repair_validations(*model_classes, &block)
+      @__stored_callbacks = {}
+      model_classes.each do |k|
+        @__stored_callbacks[k] = k._validate_callbacks.dup
+      end
+      return block.call
+    ensure
+      model_classes.each do |k|
+        k._validate_callbacks = @__stored_callbacks[k]
+        k.__update_callbacks(:validate)
+      end
+    end
+  end
+end