FAQ
Hi Hugi,

not sure this is related to your issue but i really like the way Cayenne
gives me control of the join type inside a path expression as mentioned
here:

http://cayenne.apache.org/doc/path-expressions.html

Of course this is not handled on the model level tho.

Cheers,
Daniel

Am 25.10.2011 14:03, schrieb Andrus Adamchik:
I don't think we had a discussion. We can have it now.

In this particular case my thinking is that relationship itself does not have any particular "join semantics"... It is always a match between two keys. If you just need to find objects related to a given object, using outer join never makes sense. Where it does make sense is in qualifiers. But this makes it a property of a qualifier, not the relationship.

In generally it is often hard to find such single place for many ORM properties. There's always a concern that anything beyond basic DB mapping is really a property of the execution context (e.g. it is different per-application, per-session, per-query, etc. - a good example is entity callbacks/listeners adding behavior to the mapping). So this often becomes a question of whether "one size fits all".

Andrus

On Oct 25, 2011, at 2:40 PM, Hugi Thordarson wrote:
Thank you Andrus.
Has there ever been discussion of adding the ability to specify join types when modeling relationships, or would that be at odds with design intentions? It seems like a useful feature.

Cheers,
- hugi


On 25.10.2011, at 11:23, Andrus Adamchik wrote:

Yes, in Cayenne join type is a property of a path in expression or query, not a relationship. This is by design.

Andrus
On Oct 25, 2011, at 1:54 PM, Hugi Thordarson wrote:

Good morning all.

The subject says it all, really: Cayenne seems to default to inner joins for relationships. Is it possible for me to set the join type for relationships in the model, so I don't have to specify the join type for every query? (I always want outer joins)

Cheers,
- hugi

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