On 22 Nov 2009, at 21:59, Quincey Morris wrote: > On Nov 22, 2009, at 03:39, [email protected] wrote: > >> I have a very simple object model that contains, along with 4 or 5 others, >> an abstract entity. >> The app uses NSPersistentDocument. >> >> I have created a new model version that changes a transient property to a >> modelled property in an entity derived from the above abstract entity. >> I have created my mapping model and configured the PSC with >> NSMigratePersistentStoresAutomaticallyOption. >> >> Migration always fails with multiple validation errors. >> >> Looking at the data mapping model I can see that the abstract class is not >> represented. >> >> Is this to be expected? >> >> Is migration of abstract entities troublesome? >> Some web statements state a that a mapped migration of abstract entities is >> not supported. Some other evidence that it is. >> A different model change - adding a simple BOOL attribute - also fails. >> >> Will a manual editing of the mapping model to represent the abstract entity >> help? > > It's a while since I had to deal with this, and it was under Leopard, so I > might be a bit hazy ... > > The automatically generated mapping model for an abstract entity does not do > the right thing. In my case, the abstract entity contained parent (to-1) and > child (to-many) relationships, and the model was missing the mapping for the > child relationship. I was able to fix it by creating the missing mapping > manually (using a mapping in a different entity as a guide). > > You should be able to do something similar. If you examine the mapping model > it should be fairly obvious what's missing from the abstract entity, and it > shouldn't be hard to manually add whatever's necessary to create the BOOL > attribute. (If it's not obvious, I'd first try adding the attribute to a > non-abstract entity and see what turns up in the mapping model, then back out > of the change and do the corresponding thing in the abstract entity.) Thanks for the reply.
In my case the abstract entity is entirely absent in the mapping. If I modify the model (and thus break it) to make the abstract entity concrete then it appears in the mapping. I will try recreating the abstract mapping manually. Looks like a bug report might be appropriate. > > HTH > > > _______________________________________________ > > Cocoa-dev mailing list ([email protected]) > > Please do not post admin requests or moderator comments to the list. > Contact the moderators at cocoa-dev-admins(at)lists.apple.com > > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/cocoa-dev/jonathan%40mugginsoft.com > > This email sent to [email protected] _______________________________________________ Cocoa-dev mailing list ([email protected]) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [email protected]
