otwarchive-symphonyarchive/app/mailers/README.md

If deliver_later is called within a transaction, the job is added to the Resque queue immediately, but the data written in the transaction is only available once the transaction is complete. This can cause RecordNotFound errors when sending emails about brand new objects, as well as other issues with emails containing old data.

To help avoid these transaction issues, use the deliver_after_commit method introduced by this monkeypatch, which uses the after_commit_everywhere gem to ensure that the job is only added to the queue after the transaction has finished.