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После копирования. Realm-файла из папки-location1 в папку-location2 (а также сменив его имя с location1.realm на location2.realm с помощью NSFileManager) - кажется, что после этого первый вызов этого нового файла вызывает вызов миграционного блока! (т. е. setSchemaVersion). Интересно, почему ???Копирование файла realm-файла, похоже, вызывает область вызова Migration-block - почему?
Предыдущие вызовы в файл «location1/location1.realm» не вызывали вызов блока миграции, однако запросы на «location2/location2.realm» выполняются - и файлы идентичны по структуре (по крайней мере, в Realm- Браузер нет очевидной разницы) !!
Вот мой код:
ApplicatonSuppPathHandler *ApplicationSupportPathHandler = [[ApplicatonSuppPathHandler alloc] init];
// creation of location where this directory shall be placed on the iPhone
// typically /library/Application Support/<bundleID_name>/RLMGeneralDatabasesFolderName/...
// = name of directory that the .realm-File finally should be placed in
NSString *RLMLocation1DirectoryName = folderName;
// if it does not exist already, create the RLMLocation_xyz-directory (.../library/Application Support/<bundleID_name>/RLMDatabasesFolderName)
if([ApplicationSupportPathHandler getURLToApplicationDirectoryWithSubDirectory:RLMLocation1DirectoryName] == nil) {
[ApplicationSupportPathHandler createSubDirectoryAtLocationToApplicationDirectory:RLMLocation1DirectoryName];
}
// get the name of entire directory just created
NSURL *RLMLocation1Directory = [ApplicationSupportPathHandler getURLToApplicationDirectoryWithSubDirectory:RLMLocation1DirectoryName];
// name of entire path-name (including filename !! ...needed for copy function below...)
NSString *RLMLocation1Path = [[RLMLocation1Directory path] stringByAppendingPathComponent:fileName];
// HERE IS WHERE THE MIGRATION BLOCK IS CALLED - WHY ?????
// *******************************************************
RLMRealm *realm_Location1 = [RLMRealm realmWithPath:RLMLocation1Path]; // pointing to realm file at path
// the rest does work after the migration-block call...
[realm_Location1 beginWriteTransaction];
[realm_Location1 deleteAllObjects];
[realm_Location1 addObject:RLMTopoRes];
[realm_Location1 commitWriteTransaction];
Ниже реализация используемых классов-методы ApplicationSuppPathHandler:
@implementation ApplicatonSuppPathHandler
- (NSURL*)getURLToApplicationDirectoryWithSubDirectory:(NSString*)SubDirectoryName {
NSString* appBundleID = [[NSBundle mainBundle] bundleIdentifier];
NSFileManager*fm = [NSFileManager defaultManager];
NSURL* dirPath = nil;
// Find the application support directory in the home directory.
NSArray* appSupportDir = [fm URLsForDirectory:NSApplicationSupportDirectory
inDomains:NSUserDomainMask];
if ([appSupportDir count] > 0)
{
// Append the bundle ID and the location-Foldername to the URL for the Application Support directory
dirPath = [[[appSupportDir objectAtIndex:0] URLByAppendingPathComponent:appBundleID] URLByAppendingPathComponent:SubDirectoryName];
BOOL isDir;
BOOL exists = [fm fileExistsAtPath:[dirPath path] isDirectory:&isDir];
if (exists) {
/* file exists */
if (isDir) {
/* path exists */
return dirPath;
}
else {
NSLog(@"Directory does not exist");
return nil;
}
}
else {
/* file does not exist */
return nil;
}
}
return dirPath;
}
- (void)createSubDirectoryAtLocationToApplicationDirectory:(NSString*)SubDirectoryName {
NSString* appBundleID = [[NSBundle mainBundle] bundleIdentifier];
NSFileManager*fm = [NSFileManager defaultManager];
NSURL* dirPath = nil;
// Find the application support directory in the home directory.
NSArray* appSupportDir = [fm URLsForDirectory:NSApplicationSupportDirectory
inDomains:NSUserDomainMask];
if ([appSupportDir count] > 0)
{
// Append the bundle ID and the location-Foldername to the URL for the Application Support directory
dirPath = [[[appSupportDir objectAtIndex:0] URLByAppendingPathComponent:appBundleID] URLByAppendingPathComponent:SubDirectoryName];
// If the directory does not exist, this method creates it.
// This method call works in OS X 10.7 and later only.
NSError* theError = nil;
if (![fm createDirectoryAtURL:dirPath withIntermediateDirectories:YES attributes:nil error:&theError]) {
// Handle the error.
NSLog(@"%@", theError.localizedDescription);
}
else {
// Mark the directory as excluded from iCloud backups
if (![dirPath setResourceValue:@YES
forKey:NSURLIsExcludedFromBackupKey
error:&theError]) {
NSLog(@"Error excluding %@ from iCloud backup %@", [dirPath lastPathComponent], theError.localizedDescription);
}
else {
// NSLog(@"Location Directory excluded from iClud backups");
}
}
}
}
Спасибо вы jpsim! Это отличная новость! Я думал, что поведение моего кода немного неожиданно (... но это иногда вполне нормально;) ...). Я с нетерпением жду Realm v0.88.0 !! Опять же - большое спасибо за быстрый ответ! – iKK