From 8c0ba7b69b0952e1f71425ad19e97de8f4dc1be8 Mon Sep 17 00:00:00 2001
From: Aaron Patterson <aaron.patterson@gmail.com>
Date: Tue, 8 Oct 2013 16:13:19 -0700
Subject: [PATCH] join parts in `build` are *always* new, so don't bother
 checking

---
 activerecord/lib/active_record/associations/join_dependency.rb | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/activerecord/lib/active_record/associations/join_dependency.rb b/activerecord/lib/active_record/associations/join_dependency.rb
index dace5503e5..f12d5c49b5 100644
--- a/activerecord/lib/active_record/associations/join_dependency.rb
+++ b/activerecord/lib/active_record/associations/join_dependency.rb
@@ -182,7 +182,8 @@ def find_reflection(klass, name)
       def build(associations, parent, join_type)
         associations.each do |name, right|
           reflection = find_reflection parent.base_klass, name
-          join_association = find_or_build_scalar reflection, parent, join_type
+          join_association = build_join_association reflection, parent, join_type
+          @join_parts << join_association
           build right, join_association, join_type
         end
       end