query the association rather than send the method for the association name

1 files changed, 6 insertions, 5 deletions

diff --git a/activerecord/lib/active_record/associations/preloader/through_association.rb b/activerecord/lib/active_record/associations/preloader/through_association.rb
index de06931845..b2e8f32625 100644
--- a/activerecord/lib/active_record/associations/preloader/through_association.rb
+++ b/activerecord/lib/active_record/associations/preloader/through_association.rb
@@ -27,17 +27,18 @@ module ActiveRecord
         def through_records_by_owner
           Preloader.new(owners, through_reflection.name, through_scope).run
 
-          Hash[owners.map do |owner|
-            through_records = Array.wrap(owner.send(through_reflection.name))
+          owners.each_with_object({}) do |owner, h|
+            association = owner.association through_reflection.name
+            through_records = Array(association.reader)
 
             # Dont cache the association - we would only be caching a subset
             if (through_scope != through_reflection.klass.unscoped) ||
                (reflection.options[:source_type] && through_reflection.collection?)
-              owner.association(through_reflection.name).reset
+              association.reset
             end
 
-            [owner, through_records]
-          end]
+            h[owner] = through_records
+          end
         end
 
         def through_scope