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-rw-r--r--activerecord/lib/active_record/persistence.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index b48a137a73..a57c60ffac 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -322,7 +322,7 @@ module ActiveRecord
def becomes(klass)
became = klass.new
became.instance_variable_set("@attributes", @attributes)
- became.instance_variable_set("@mutation_tracker", @mutation_tracker) if defined?(@mutation_tracker)
+ became.instance_variable_set("@mutations_from_database", @mutations_from_database) if defined?(@mutations_from_database)
became.instance_variable_set("@changed_attributes", attributes_changed_by_setter)
became.instance_variable_set("@new_record", new_record?)
became.instance_variable_set("@destroyed", destroyed?)