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## unreleased ##
+* fixes bug introduced by #3329. Now, when autosaving associations,
+ deletions happen before inserts and saves. This prevents a 'duplicate
+ unique value' database error that would occur if a record being created had
+ the same value on a unique indexed field as that of a record being destroyed.
+
+ Backport of #10417
+
+ *Johnny Holton*
+
* Fix that under some conditions, Active Record could produce invalid SQL of the sort:
"SELECT DISTINCT DISTINCT".