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This is a backport of #10417 fixes bug introduced by #3329 These are the conditions necessary to reproduce the bug: - For an association, autosave => true. - An association record is being destroyed - A new association record is being created. - There is a unique index one of the association's fields. - The record being created has the same value as the record being destroyed on the indexed field. Before, the deletion of records was postponed until after all insertions/saves. Therefore the new record with the identical value in the indexed field caused a non-unique value error to be thrown at the database level. With this fix, the deletions happen first, before the insertions/saves. Therefore the record with the duplicate value is gone from the database before the new record is created, thereby avoiding the non-uniuqe value error.