From c8932d6ec516cb266084d59423b7ecc688a42bc0 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@gmail.com>
Date: Fri, 11 Jun 2021 09:12:36 +0200
Subject: [PATCH] Make `primary_key_prefix_type` a class attribute

Followup: https://github.com/rails/rails/pull/42442
---
 activerecord/lib/active_record/model_schema.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/activerecord/lib/active_record/model_schema.rb b/activerecord/lib/active_record/model_schema.rb
index 8ce155ff9f..c7d83b8c6a 100644
--- a/activerecord/lib/active_record/model_schema.rb
+++ b/activerecord/lib/active_record/model_schema.rb
@@ -127,8 +127,7 @@ module ModelSchema
     # <tt>attribute :foo, :string</tt>. Defaults to false.
 
     included do
-      mattr_accessor :primary_key_prefix_type, instance_writer: false
-
+      class_attribute :primary_key_prefix_type, instance_writer: false
       class_attribute :table_name_prefix, instance_writer: false, default: ""
       class_attribute :table_name_suffix, instance_writer: false, default: ""
       class_attribute :schema_migrations_table_name, instance_accessor: false, default: "schema_migrations"