1 files changed, 4 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/relation/predicate_builder.rb b/activerecord/lib/active_record/relation/predicate_builder.rb
index 61d9974570..80b5495569 100644
--- a/activerecord/lib/active_record/relation/predicate_builder.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder.rb
@@ -18,7 +18,10 @@ module ActiveRecord
           attribute = table[column.to_sym]
 
           case value
-          when Array, ActiveRecord::Associations::AssociationCollection, ActiveRecord::Relation
+          when ActiveRecord::Relation
+            value.select_values = Array.wrap("#{value.klass.quoted_table_name}.id") if value.select_values.empty?
+            attribute.in(value.arel.ast)
+          when Array, ActiveRecord::Associations::AssociationCollection
             values = value.to_a.map { |x|
               x.is_a?(ActiveRecord::Base) ? x.id : x
             }