On Wed, Nov 18, 2020 at 03:19:16PM +0000, John Rouillard wrote:
> 
> I have an initial read only implementation of this setup.

Cool!

...
> I am still using the classname Computed, but I think it needs a better
> name. Maybe: Operator, Agent, Broker (my fave so far), Proxy... 
> Suggestions?

I'd keep Computed as the base class. Other implementation may chose to
derive from it.
It would be nice to make a derived class that can search, too, like
your implementation of the number of items: This could map to some SQL
code and thus be searchable, too. (Maybe this needs two different SQL
parts, one for search one for display, I haven't looked too closely yet)

Concerning read-only: My guess is that most computed properties will be
read-only.

Ralf
-- 
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