> 1) When fetching data rows, can I limit the set of fields fetched, i.e. is > there an equivalent to EOF’s EOFetchSpecification.setRawRowKeyPaths( NSArray > )?
Not right now. This is doable with EJBQLQuery (it allows to specify individual columns, aggregate functions, etc). This functionality is coming soon to SelectQuery/ObjectSelect (probably in M3). > 2) When specifying the prefetch, why do I have to addPrefetch( > A.SOME_REL.joint() ) instead of just doing addPrefetch( “someRel” )? You can still use the String. A.SOME_REL form is an alternative that gives you a compile-time guarantee that your property name is valid . > When traversing further relationships, is this the correct way? : > > q.addPrefetch( PrefetchTreeNode.withPath( "shop.chain", 1 ) ); q.addPrefetch( A.SHOP.dot(Shop.CHAIN).disjoint()) is probably a cleaner way. Andrus > On Apr 1, 2015, at 1:38 PM, Hugi Thordarson <h...@karlmenn.is> wrote: > > This is perfect, thank you :). Couple of additional questions though: > > 1) When fetching data rows, can I limit the set of fields fetched, i.e. is > there an equivalent to EOF’s EOFetchSpecification.setRawRowKeyPaths( NSArray > )? > > 2) When specifying the prefetch, why do I have to addPrefetch( > A.SOME_REL.joint() ) instead of just doing addPrefetch( “someRel” )? When > traversing further relationships, is this the correct way? : > > q.addPrefetch( PrefetchTreeNode.withPath( "shop.chain", 1 ) ); > > Cheers, > - hugi > > // Hugi Thordarson > // http://www.loftfar.is/ <http://www.loftfar.is/> > // s. 895-6688 > > > >> On 31. okt. 2014, at 10:34, Andrus Adamchik <and...@objectstyle.org> wrote: >> >> If I understand the task correctly, a combination of JOINT prefetching and >> "data rows" should probably do the trick: >> >> SelectQuery<A> query = new SelectQuery<>(A.class); >> query.addPrefetch(A.SOME_REL.joint()); >> query.setFetchingDataRows(true); >> >> Andrus >> >>> On Oct 31, 2014, at 1:14 PM, Hugi Thordarson <h...@karlmenn.is> wrote: >>> >>> Hi all. >>> >>> Once again, I’m looking into migrating to Cayenne from EOF :). One question >>> though: Our code depends heavily on raw row fetching (data rows) that >>> traverses relationships. I haven’t looked much at the Cayenne code, but do >>> you believe adding support for this to Cayenne would be a huge undertaking? >>> Or does Cayenne perhaps provide an alternative method to achieve the same >>> results? >>> >>> Cheers, >>> - hugi >>> >>> PS: My apologies for the previous post, which my brain for some reason >>> decided to post as an answer to an older thread. I’m still on my first cup >>> of coffee, and it’s a really Monday-ish Friday up here. >>> >>> // Hugi Thordarson >>> // http://www.loftfar.is/ <http://www.loftfar.is/> >>> // s. 895-6688 >> >
