1 files changed, 15 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 1183bdf6f4..10978b2d93 100644
--- a/activerecord/lib/active_record/associations/has_one_through_association.rb
+++ b/activerecord/lib/active_record/associations/has_one_through_association.rb
@@ -1,20 +1,21 @@
+# frozen_string_literal: true
+
 module ActiveRecord
-  # = Active Record Has One Through Association
   module Associations
+    # = Active Record Has One Through Association
     class HasOneThroughAssociation < HasOneAssociation #:nodoc:
       include ThroughAssociation
 
-      def replace(record)
-        create_through_record(record)
-        self.target = record
-      end
-
       private
+        def replace(record, save = true)
+          create_through_record(record, save)
+          self.target = record
+        end
 
-        def create_through_record(record)
+        def create_through_record(record, save)
           ensure_not_nested
 
-          through_proxy  = owner.association(through_reflection.name)
+          through_proxy  = through_association
           through_record = through_proxy.load_target
 
           if through_record && !record
@@ -27,8 +28,12 @@ module ActiveRecord
             end
 
             if through_record
-              through_record.update(attributes)
-            elsif owner.new_record?
+              if through_record.new_record?
+                through_record.assign_attributes(attributes)
+              else
+                through_record.update(attributes)
+              end
+            elsif owner.new_record? || !save
               through_proxy.build(attributes)
             else
               through_proxy.create(attributes)