Smart Containers

[Stefan Urbanek]

On 6.2.2007, at 11:27, Christiaan Hofman wrote:

<snip>

>
> And did you consider that NSPersistentDocument creates a store by  
> default (though perhaps that doesn't happen now)? I don't see why  
> you need the unsavedDocumentStore. Usually new objects belong to a  
> document, so the persistent store for that document is present to  
> put them in. I can imagine that you're doing something wrong with  
> the migration, I don't know too much about that myself (never used  
> it, because I never needed it).
>
> What I do, and it works perfect, is create the inMemoryStore in the  
> -init of my persistent document.
>
> inMemoryStore = [[coordinator  
> addPersistentStoreWithType:NSInMemoryStoreType
>                 configuration:@"InMemoryConfiguration" URL:nil  
> options:nil error:nil] retain];
>
> I use a separate configuration for non-perstistent entities like  
> Library groups, so I don't have to explicitly assign them. Whether  
> you can do that depends on your model. My - 
> configurePersistentStoreCoordinatorForURL:... basically does this:
>
>     [coordinator addPersistentStoreWithType:storeType  
> configuration:@"PersistentConfiguration" URL:url options:nil  
> error:&outError];
>
> The InMemoryConfiguration and PersistentConfiguration are mutually  
> exclusive configurations. If you explicitly assign objects to a  
> particular store, as in CoreRecipies, you don't need  
> configurePersistentStoreCoordinatorForURL:... at all, as the  
> default implementation will do. I don't need anything else.
>
> Christiaan
>

Thanks, this works like a charm :) and is much cleaner. I was not  
thinking about using configurations.

Only thing I needed to change was to add another (sub)entity for  
representing built-in smart folders, as they are only kind of smart  
folders that are in memory (others can be in the document store).

Regards,

Stefan
<rest snipped>

Stefan Urbanek
--
http://stefan.agentfarms.net

First they ignore you, then they laugh at you, then they fight you,  
then you win.
- Mahatma Gandhi