Pass SQL group by values when including scoped association

Fixes problem when added `group()` in association scope was lost
in eager loaded association.

1 files changed, 5 insertions, 1 deletions

diff --git a/activerecord/lib/active_record/associations/preloader/association.rb b/activerecord/lib/active_record/associations/preloader/association.rb
index e11a5cfb8a..91e7f90739 100644
--- a/activerecord/lib/active_record/associations/preloader/association.rb
+++ b/activerecord/lib/active_record/associations/preloader/association.rb
@@ -107,7 +107,7 @@ module ActiveRecord
           @preloaded_records = slices.flat_map do |slice|
             records_for(slice)
           end
-          @preloaded_records.group_by do |record| 
+          @preloaded_records.group_by do |record|
             convert_key(record[association_key_name])
           end
         end
@@ -139,6 +139,10 @@ module ActiveRecord
             scope.order!(order_values)
           end
 
+          if group_values = preload_values[:group] || values[:group]
+            scope.group!(group_values)
+          end
+
           if preload_values[:reordering] || values[:reordering]
             scope.reordering_value = true
           end