1 files changed, 12 insertions, 10 deletions
diff --git a/activerecord/lib/active_record/associations/has_one_through_association.rb b/activerecord/lib/active_record/associations/has_one_through_association.rb
index d93c8e7852..830aa1808a 100644
--- a/activerecord/lib/active_record/associations/has_one_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_through_association.rb
@@ -1,6 +1,16 @@
+require "active_record/associations/through_association_scope"
+
 module ActiveRecord
   module Associations
-    class HasOneThroughAssociation < HasManyThroughAssociation
+    class HasOneThroughAssociation < HasOneAssociation
+      include ThroughAssociationScope
+
+      def replace(new_value)
+        create_through_record(new_value)
+        @target = new_value
+      end
+
+      private
 
       def create_through_record(new_value) #nodoc:
         klass = @reflection.through_reflection.klass
@@ -15,16 +25,8 @@ module ActiveRecord
       end
 
     private
-      def find(*args)
-        super(args.merge(:limit => 1))
-      end
-
       def find_target
-        super.first
-      end
-
-      def reset_target!
-        @target = nil
+        with_scope(construct_scope) { @reflection.klass.find(:first) }
       end
     end
   end