Integration as Composition
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I’m puzzling over the design for a worker and would appreciate your comments on it. I started with the pain of an ugly test, made an interesting refactoring, and decided to drop the test entirely, but I’m not at all sure this is the right decision.

In my mailing list archive Chibrary, I want to sum up the number of threads and messages in a month to present on archive pages. The MonthCountWorker takes a Sym, a unique identifier for a list’s slug + year + month, fetchs the threads for that month, sums them, and stores the sum. The code is trivial, right?:

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