allow AssociationProxy#scoped to take options so that API is the same as Base#scoped

activerecord/lib/active_record/associations/collection_proxy.rb

@@ -61,11 +61,15 @@ def proxy_association
         @association
       end
 
-      def scoped
+      def scoped(options = nil)
         association = @association
-        association.scoped.extending do
+        scope       = association.scoped
+
+        scope.extending! do
           define_method(:proxy_association) { association }
         end
+        scope.merge!(options) if options
+        scope
       end
 
       def respond_to?(name, include_private = false)

activerecord/test/cases/associations_test.rb

@@ -214,6 +214,10 @@ def test_proxy_association_accessor
     david = developers(:david)
     assert_equal david.association(:projects), david.projects.proxy_association
   end
+
+  def test_scoped_allows_conditions
+    assert developers(:david).projects.scoped(where: 'foo').where_values.include?('foo')
+  end
 end
 
 class OverridingAssociationsTest < ActiveRecord::TestCase