On May 30, 2008, at 2:32 PM, Chuck Hill wrote:
On May 30, 2008, at 1:19 PM, Mike Schrag wrote:
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).
I am curious too. I'd rather shoot myself than not flatten to many
relationships. I'd almost rather use J2EE. Like Mike says, across
databases is a problem. Across models is not if you are sensible
enough to ensure consistent connection dictionaries when they load
(which I think is safe to assume here).
Like I was saying to Mike, it's simply a guard against performance
issues. It's like omitting inverse relationships
when you know that it would be suicide if anyone tried to traverse
(or inadvertently tripped) them.
e.g. transaction -> user_agent is a fine relationship to model but
would you even dream of modeling the inverse relationship?
Maybe you would if you only made one sale a week.
Alan
Chuck
--
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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