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-rw-r--r--activerecord/test/models/citation.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activerecord/test/models/citation.rb b/activerecord/test/models/citation.rb
index 7d06387f56..8a6c300a28 100644
--- a/activerecord/test/models/citation.rb
+++ b/activerecord/test/models/citation.rb
@@ -1,3 +1,4 @@
+# frozen_string_literal: true
class Citation < ActiveRecord::Base
belongs_to :reference_of, class_name: "Book", foreign_key: :book2_id
end