IMHO you should never flatten a many-to-many (especially across
models).
So this is interesting ... I held this same belief for years until
about 6 months ago when Chuck convinced me that I was missing out :)
I had some silly misunderstanding of EOF caching with respect to
flattened relationships that Chuck proved was wrong. I've since been
pretty happy with them (though admittedly I've never crossed model
boundaries). I'm curious what you're reasoning for not flattening
is? Definitely it will fail across databases boundaries (which
totally makes sense), but it's not immediately obvious that (or rather
why) it would fail across model boundaries onto the same database
(assuming you have the EXACT same connection dictionary between the
two).
ms
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