Re: [Newbie]ManyToMany
Re: [Newbie]ManyToMany
- Subject: Re: [Newbie]ManyToMany
- From: Jonathan Rochkind <email@hidden>
- Date: Wed, 17 Mar 2004 16:48:33 -0600
At 5:26 PM -0500 3/17/04, Kieran Kelleher wrote:
Forget having EoModeler make a many-to-many.
Just make relationships such as:
T1 <=>>T2 and T2<<=>T3, (where > is a to-one and >> is a to-many)
then you can use T1.T2.T3(), T3.T2.T1() and also use flattened
T1.T3() or T3.T1()
How could you use those flattened relationships from T1 to T3? Are
you suggesting defining the flattened relationship in the EOModel as
a class property, and ALSO defining the direct relationship as a
class property? I think this is rather a bad idea myself, but if
you've done it succesfully I'm interested in hearing about it.
Otherwise.... how could you "also use flattened T1.T3() or T3.T1()"?
My experience is you either use flattened relationships, or you
don't. If you don't (perhaps because you need exposed attributes in
the intermediary table), then you've got to go through the
intermediary table to get from T1 to T3 or vice versa.
--Jonathan
-K
On Mar 17, 2004, at 4:17 PM, Emmanuel KOPP wrote:
Hi all,
I've 3 tables
T1 => groups (groupID)
T3 => forums (forumID)
T2 => Auth_Access (groupID and forumID + more attributes)
T1 is connected to T3 via a manyTomany (T2).
My problems is that T2 must have other attributes which I must be
able to reach from T1 or/and T3
I tested a flattened table but the result is not convincing
All help would be useful for me.
Thank
Manu
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