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-rw-r--r--guides/rails_guides/indexer.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/guides/rails_guides/indexer.rb b/guides/rails_guides/indexer.rb
index c58b6b85a2..63dbfd5e2c 100644
--- a/guides/rails_guides/indexer.rb
+++ b/guides/rails_guides/indexer.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
require "active_support/core_ext/object/blank"
require "active_support/core_ext/string/inflections"