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-rw-r--r--activerecord/lib/active_record/readonly_attributes.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/readonly_attributes.rb b/activerecord/lib/active_record/readonly_attributes.rb
index 836b15e2ce..960b78dc38 100644
--- a/activerecord/lib/active_record/readonly_attributes.rb
+++ b/activerecord/lib/active_record/readonly_attributes.rb
@@ -6,7 +6,7 @@ module ActiveRecord
extend ActiveSupport::Concern
included do
- config_attribute :_attr_readonly
+ class_attribute :_attr_readonly, instance_writer: false
self._attr_readonly = []
end