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-rw-r--r--activerecord/lib/active_record/reflection.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/reflection.rb b/activerecord/lib/active_record/reflection.rb
index 5b9d45d871..a549b28f16 100644
--- a/activerecord/lib/active_record/reflection.rb
+++ b/activerecord/lib/active_record/reflection.rb
@@ -371,7 +371,7 @@ module ActiveRecord
end
def foreign_key
- @foreign_key ||= options[:foreign_key] || derive_foreign_key
+ @foreign_key ||= options[:foreign_key] || derive_foreign_key.freeze
end
def association_foreign_key