While writing specs I keep learning this lesson over and over. After calling methods on your data model and saving it to the database, call the reload method to refresh your model. Otherwise, subsequent operations will be performed on stale data.
Do this in your engines and other business logic components that change & persist data. When calling myObject.do_something, which changes and saves internal state and you need to continue using myObject in the rest of your method, first call myObject.reload.
There. I've gotten it off my chest and I feel better.
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