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-rw-r--r--activerecord/test/models/traffic_light.rb2
1 files changed, 2 insertions, 0 deletions
diff --git a/activerecord/test/models/traffic_light.rb b/activerecord/test/models/traffic_light.rb
index a6b7edb882..0b88815cbd 100644
--- a/activerecord/test/models/traffic_light.rb
+++ b/activerecord/test/models/traffic_light.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
class TrafficLight < ActiveRecord::Base
serialize :state, Array
serialize :long_state, Array