I’ve been struggling to come up with an Ash aggregation or calculation that works on a Time attribute. The attribute in question:

    attribute :duration, :time do
      allow_nil? false
      public? true
    end

What I had thought would be a super-simple sum aggregation ended up… not working at all:

     * ** (Protocol.UndefinedError) protocol Enumerable not implemented for type Integer. This protocol is implemented for the following type(s): DBConnection.PrepareStream, DBConnection.Stream, Date.Range, Ecto.Adapters.SQL.Stream, File.Stream, Function, GenEvent.Stream, HashDict, HashSet, IO.Stream, Iter, Jason.OrderedObject, LazyHTML, List, Map, MapSet, Phoenix.LiveView.LiveStream, Postgrex.Stream, Range, Req.Response.Async, Rewrite, Stream, StreamData

Which led me down a path of a custom implementation, which became messy. Then I switched to a calculation. My calculation isn’t working yet, but it’s getting long and complicated and just seems like there should be a better (simpler) way.

I keep wondering if I’m missing something in the basic aggregate DSL syntax.

I can paste in my calculation if anyone wants to see it but at the moment it’s a mess. Hoping someone just points me at a better solution.