Re: EO: Creating Relationships - BOGUS?
Re: EO: Creating Relationships - BOGUS?
- Subject: Re: EO: Creating Relationships - BOGUS?
- From: Arturo Pérez <email@hidden>
- Date: Fri, 1 Aug 2003 22:56:19 -0400
On Friday, August 1, 2003, at 10:13 PM, Goodbye Bill wrote:
Okay, maybe I'm missing something, but NOW that I see how to use the
GUI of
EOModeler to create many-to-many relationships, that got me thinking...
How the heck is one supposed to create ONE-to-many relationships?
Up until this past weekend, I've been manually populating ALL of my
primary
and foreign keys in my code. I stopped doing this once I received a
smack
upside the head, from the group, a few days ago. Now, I let EO handle
all
of my keys directly... just use the "join many-to-many" function and
PRESTO!
Well, EOM handles many-to-many joins itself but don't you still have to
specify
the primary key of your entities?
I don't see any way to get EOM to create all of your primary and
foreign keys.
I've always specified my own primary keys and foreign keys in EOM. Or
rather,
I always put in my own key attributes and set up the relationships.
EOM can
then figure out which are foreign keys, etc.
But in the Java code you don't need to worry about that. All you do is
eo1.addObjectToBothSidesOfRelationshipWithKey(eo2, "key");
So, the scenario is
1. Create entity Album with attribute PK, Name.
2. Create entity Song with attributes PK, Name, AlbumFK
3. Add relationship toSongs to Album. You'll see in the Inspector
where you specify what attributes to join against. You can
then turn off (via the black diamonds) those PK & FK attributes.
4. When you add the relationship toSongs the Inspector will come up
and you specify whether it's toOne toMany etc etc etc.
-------
WebObjects in Philadelphia. You want a cheesesteak with that?
_______________________________________________
webobjects-dev mailing list | email@hidden
Help/Unsubscribe/Archives: http://www.lists.apple.com/mailman/listinfo/webobjects-dev
Do not post admin requests to the list. They will be ignored.