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-rw-r--r--activerecord/test/models/string_key_object.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/test/models/string_key_object.rb b/activerecord/test/models/string_key_object.rb
index f084ec1bdc..473c145f4c 100644
--- a/activerecord/test/models/string_key_object.rb
+++ b/activerecord/test/models/string_key_object.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
class StringKeyObject < ActiveRecord::Base
self.primary_key = :id
end