Databases
StackOverflow2013
Postsdbo
POManual Core Data schema migration without "document changed" warning?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POManual Core Data schema migration without "document changed" warning?
    primarykey
    data
    text
    <p>The data model for my Core Data document-based app (10.5 only) is in a framework, so automatic schema upgrades using a Core Data mapping model don't appear to work. It appears that the Core Data machinery doesn't find the appropriate data models or mapping model when they are not in the app's main bundle. So, instead of using the automatic migration, I'm running a migration manually in <code>configurePersistentStoreCoordinatorForURL:ofType:...</code> in my <code>NSPersistenDocument</code> subclass (code below). I migrate the persistent store to a temporary file and then overwrite the existing file if the migration succeeds. The document then presents an error with the message "This document's file has been changed by another application since you opened or saved it." when I try to save. As others on this list have pointed out, this is due to my modification of the document's file "behind its back". I tried updating the document's file modification date, as shown below, but I then get an error dialog with the message "The location of the document "test.ovproj" cannot be determined." when I try to save. I'm less sure of the reason for this error, but trading one unnecessary message (in this case) for an other isn't quite what I was going for.</p> <p>Can anyone offer some guidance? Is there a way to manually upgrade the schema for a document's persistent store without triggering one of these (in <em>this</em> case unnecessary) warnings?</p> <p>code for upgrading the data store in my subclasses <code>-configurePersistentStoreCoordinatorForURL:ofType:...</code> :</p> <pre><code>if(upgradeNeeded) { NSManagedObjectModel *sourceModel = [NSManagedObjectModel mergedModelFromBundles:VUIModelBundles() orStoreMetadata:meta]; if(sourceModel == nil) { *error = [NSError errorWithDomain:VUIErrorDomainn ode:VUICoreDataErrorCode localizedReason:BWLocalizedString(@"Unable to find original data model for project.")]; return NO; } NSManagedObjectModel *destinationModel = [self managedObjectModel]; NSMigrationManager *migrationManager = [[NSMigrationManager alloc] initWithSourceModel:sourceModel destinationModel:destinationModel]; NSMappingModel *mappingModel = [NSMappingModel mappingModelFromBundles:VUIModelBundles() forSourceModel:sourceModel destinationModel:destinationModel]; if(mappingModel == nil) { *error = [NSError errorWithDomain:VUIErrorDomain code:VUICoreDataErrorCode localizedReason:BWLocalizedString(@"Unable to find mapping model to convert project to most recent project format.")]; return NO; } @try { //move file to backup NSAssert([url isFileURL], @"store url is not a file URL"); NSString *tmpPath = [NSString tempFilePath]; id storeType = [meta objectForKey:NSStoreTypeKey]; if(![migrationManager migrateStoreFromURL:url type:storeType options:storeOptions withMappingModel:mappingModel toDestinationURL:[NSURLfileURLWithPath:tmpPath] destinationType:storeType destinationOptions:storeOptions error:error]) { return NO; } else { //replace old with new if(![[NSFileManager defaultManager] removeItemAtPath:[url path] error:error] || ![[NSFileManager defaultManager] moveItemAtPath:tmpPath toPath:[url path] error:error]) { return NO; } // update document file modification date to prevent warning (#292) NSDate *newModificationDate = [[[NSFileManager defaultManager] fileAttributesAtPath:[url path] traverseLink:NO] bjectForKey:NSFileModificationDate]; [self setFileModificationDate:newModificationDate]; } } @finally { [migrationManager release]; } } } return [super configurePersistentStoreCoordinatorForURL:url ofType:fileType modelConfiguration:configuration storeOptions:storeOptions error:error]; </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USwestsider
    1. USBarry Wark
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POManual Core Data schema migration without "document changed" warning?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POManual Core Data schema migration without "document changed" warning?
      1. USggould75
      1. VTFavorite
    3. VO
      singulars
      1. POManual Core Data schema migration without "document changed" warning?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload