2007/10/26, Lachlan Deck <email@hidden>:
On 25/10/2007, at 7:37 PM, Daniele Corti wrote:
> > 2007/10/25, Lachlan Deck <email@hidden>:
> >> You have two choices with M2M Join tables.
> >> A<-->>AB<<-->B
> >>
> >> 1) flatten the relationships... so that you're adding to both sides
> >> of relationship two records on either side of the join. Join
> records
> >> using EOGenericRecord and don't have any logic in them.
> >>
> >> A myA = (A)EOUtilties.createAndInsertInstance(ec, "A");
> >> B myB = (B)EOUtilties.createAndInsertInstance(ec, "B");
> >> myA.addObjectToBothSidesOfRelationshipWithKey(myB, "bs");
> >
> > How this work? Do you need to set the EOmodel in some way?
>
> Flattening relationships involves creating a many-to-many join like
> here:
> http://wiki.objectstyle.org/confluence/display/WOL/Creating+a+Many+to
> +Many+Join
>
> Thank you, but is there a way in EOModeler? (really, I've never
> completely understand how to user Entity Modeler)
Sure.
1) Select two entities (make sure you've given them a primary key
each, an entity name, external name)
2) Choose Property > Join in Many to Many
3) make sure join entity has its external name and entityName as
desired.
That's Perfect, thank you!
The concept in Entity Modeler is similar - but far less buggy....
i.e., select two entities, right-click, choose New Relationship...
and follow the prompts. I really suggest that you jump over to using
WOLips now. Really, the water is fine, there's lots of help available.
> > 2) don't flatten the relationships
>
> Otherwise, create normal toMany relationship from A to AB, and B to
> AB in the modeler.
>
> Usually I use this , but I like to continue learning new way to do
> things ;-P
with regards,
--
Lachlan Deck
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