Reapply extensions when using except and only

activerecord/lib/active_record/relation/spawn_methods.rb

@@ -79,6 +79,9 @@ module ActiveRecord
         result.send(:"#{method}_value=", send(:"#{method}_value"))
       end
 
+      # Apply scope extension modules
+      result.send(:apply_modules, extensions)
+
       result
     end
 
@@ -100,6 +103,9 @@ module ActiveRecord
         result.send(:"#{method}_value=", send(:"#{method}_value"))
       end
 
+      # Apply scope extension modules
+      result.send(:apply_modules, extensions)
+
       result
     end
 

activerecord/test/cases/relations_test.rb

@@ -797,6 +797,10 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal Post.all, all_posts.all
   end
 
+  def test_extensions_with_except
+    assert_equal 2, Topic.named_extension.order(:author_name).except(:order).two
+  end
+
   def test_only
     relation = Post.where(:author_id => 1).order('id ASC').limit(1)
     assert_equal [posts(:welcome)], relation.all
@@ -808,6 +812,10 @@ class RelationTest < ActiveRecord::TestCase
     assert_equal Post.limit(1).all.first, all_posts.first
   end
 
+  def test_extensions_with_only
+    assert_equal 2, Topic.named_extension.order(:author_name).only(:order).two
+  end
+
   def test_anonymous_extension
     relation = Post.where(:author_id => 1).order('id ASC').extending do
       def author