rubycocoa-talk

[Rubycocoa-talk] Don't understand what I did wrong

[Pierce T. W. I. <pi...@tw...>]

The code:

    
@storeMetaDeta 
=NSPersistentStore.metadataForPersistentStoreWithURL_error(url,error)

The error:

2008-02-29 10:36:04.750 Frictionless[48280:813]  
AppDelegate#openAllWindows: OSX::OCException:  
NSInvalidArgumentException - *** - 
metadataForPersistentStoreWithURL:error: cannot be sent to an abstract  
object of class NSPersistentStore: Create a concrete instance!

Re: [Rubycocoa-talk] Don't understand what I did wrong

[Avram L. <aj...@gm...>]

On Fri, Feb 29, 2008 at 9:40 PM, Pierce T. Wetter III
<pi...@tw...> wrote:
>  The code:
>
>  @storeMetaDeta
>  =NSPersistentStore.metadataForPersistentStoreWithURL_error(url,error)

Looking at the class documentation
(http://developer.apple.com/documentation/Cocoa/Reference/NSPersistentStore_Class/Reference/NSPersistentStore.html#//apple_ref/occ/clm/NSPersistentStore/metadataForPersistentStoreWithURL:error:),
NSPersistentStore.metadataForPersistentStoreWithURL_error is supposed
to be a class method.

Could RubyCocoa be mangling the mapping?

Try initializing a store instance with
initWithPersistentStoreCoordinator:configurationName:URL:options: and
then use metadataForPersistentStoreWithURL_error on the instance. I
realize that defeats the purpose of getting metadata with a class and
not instance method, but it might help understand what's going on.

Avram

Re: [Rubycocoa-talk] Don't understand what I did wrong

[Pierce T. W. I. <pi...@tw...>]

On Feb 29, 2008, at 10:50 AM, Avram Lyon wrote:

> On Fri, Feb 29, 2008 at 9:40 PM, Pierce T. Wetter III
> <pi...@tw...> wrote:
>> The code:
>>
>> @storeMetaDeta
>> =NSPersistentStore.metadataForPersistentStoreWithURL_error(url,error)
>
> Looking at the class documentation
> (http://developer.apple.com/documentation/Cocoa/Reference/NSPersistentStore_Class/Reference/NSPersistentStore.html#/ 
> /apple_ref/occ/clm/NSPersistentStore/ 
> metadataForPersistentStoreWithURL:error:),
> NSPersistentStore.metadataForPersistentStoreWithURL_error is supposed
> to be a class method.

  Yes, it is.
>
>
> Could RubyCocoa be mangling the mapping?
>
> Try initializing a store instance with
> initWithPersistentStoreCoordinator:configurationName:URL:options: and
> then use metadataForPersistentStoreWithURL_error on the instance. I
> realize that defeats the purpose of getting metadata with a class and
> not instance method, but it might help understand what's going on.

   I'm in sort of a catch-22.

   I can't build a persistentStoreCoordinator without an  
NSManagedObjectModel. I can't build one of those because

		@managedObjectModel =  
OSX::NSManagedObjectModel.mergedModelFromBundles(allBundles.allObjects)

  is choking, giving me an exception for trying to insert nil in an  
NSArray. So I'm trying to do this instead:

		@managedObjectModel =  
OSX 
::NSManagedObjectModel 
.mergedModelFromBundles_forStoreMetaData 
(allBundles.allObjects,@storeMetaData)

  but in order to do that, I have to be able to extract the metadata  
from the file without creating a store...

  Pierce

Re: [Rubycocoa-talk] Don't understand what I did wrong

[Pierce T. W. I. <pi...@tw...>]

>
>
  hmm.... Seems there's a:

+ (NSDictionary *)metadataForPersistentStoreOfType:(NSString  
*)storeType URL:(NSURL *)url error:(NSError **)error


declared in the online docs, but not in my XCode docs.

http://developer.apple.com/documentation/Cocoa/Reference/CoreDataFramework/Classes/NSPersistentStoreCoordinator_Class/Reference/NSPersistentStoreCoordinator.html#/ 
/apple_ref/doc/uid/TP30001180-SW5

Pierce

Re: [Rubycocoa-talk] Don't understand what I did wrong

[Eloy D. <e....@su...>]

Hi Pierce,

I haven't looked at the dcoumentation, but I'm guessing that the error  
is passed as a pointer,
which doesn't work in RC. So what the bridge will do for you is  
recognize this and simply return
and new NSError instance for you. So the method call should look like:

@storeMetaDeta, error =  
NSPersistentStore.metadataForPersistentStoreWithURL_error(url)

As you can see we only pass 1 arg and 2 objects will be returned.

Cheers,
Eloy

On 29 feb 2008, at 19:40, Pierce T. Wetter III wrote:

>
> The code:
>
>   
> @storeMetaDeta 
> =NSPersistentStore.metadataForPersistentStoreWithURL_error(url,error)
>
> The error:
>
> 2008-02-29 10:36:04.750 Frictionless[48280:813]  
> AppDelegate#openAllWindows: OSX::OCException:  
> NSInvalidArgumentException - *** - 
> metadataForPersistentStoreWithURL:error: cannot be sent to an  
> abstract object of class NSPersistentStore: Create a concrete  
> instance!
>
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