1 files changed, 5 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb b/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
index 9bb2f8c8dc..7029ae5f47 100644
--- a/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
+++ b/activerecord/lib/active_record/relation/predicate_builder/polymorphic_array_value.rb
@@ -1,8 +1,6 @@
 module ActiveRecord
   class PredicateBuilder
     class PolymorphicArrayValue # :nodoc:
-      attr_reader :associated_table, :values
-
       def initialize(associated_table, values)
         @associated_table = associated_table
         @values = values
@@ -17,6 +15,11 @@ module ActiveRecord
         end
       end
 
+      # TODO Change this to private once we've dropped Ruby 2.2 support.
+      # Workaround for Ruby 2.2 "private attribute?" warning.
+      protected
+        attr_reader :associated_table, :values
+
       private
         def type_to_ids_mapping
           default_hash = Hash.new { |hsh, key| hsh[key] = [] }