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-rw-r--r--activerecord/lib/active_record/attribute_methods/dirty.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/attribute_methods/dirty.rb b/activerecord/lib/active_record/attribute_methods/dirty.rb
index e8a782ed13..0bcfa5f00d 100644
--- a/activerecord/lib/active_record/attribute_methods/dirty.rb
+++ b/activerecord/lib/active_record/attribute_methods/dirty.rb
@@ -133,7 +133,7 @@ module ActiveRecord
end
def previous_mutation_tracker
- @previous_mutation_tracker ||= NullMutationTracker.new
+ @previous_mutation_tracker ||= NullMutationTracker.instance
end
def cache_changed_attributes