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-rw-r--r--activerecord/lib/active_record/attribute_methods/primary_key.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/primary_key.rb b/activerecord/lib/active_record/attribute_methods/primary_key.rb
index b9b2acff37..ca21eae7c1 100644
--- a/activerecord/lib/active_record/attribute_methods/primary_key.rb
+++ b/activerecord/lib/active_record/attribute_methods/primary_key.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "set"
module ActiveRecord