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@phillbaker

phillbaker/DataManager.h

Forked from rojotek/DataManager.h
Created August 7, 2012 15:43
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Revisions

  1. phillbaker revised this gist Aug 7, 2012. 1 changed file with 15 additions and 0 deletions.
    15 changes: 15 additions & 0 deletions DataManager.m
    View file
    Original file line number Diff line number Diff line change
    @@ -69,6 +69,21 @@ - (NSPersistentStoreCoordinator*)persistentStoreCoordinator {
    URL:storeURL
    options:options
    error:&error]) {
    /*
    TODO: Replace this implementation with code to handle the error appropriately.
    ...
    If you encounter schema incompatibility errors during development, you can reduce their frequency by:
    * Simply deleting the existing store:
    [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil]
    * Performing automatic lightweight migration by passing the following dictionary as the options parameter:
    [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil];
    */


    NSLog(@"Fatal error while creating persistent store: %@", error);
    abort();
    }
  2. @rojotek rojotek revised this gist Apr 11, 2012. 1 changed file with 4 additions and 10 deletions.
    14 changes: 4 additions & 10 deletions DataManager.m
    View file
    Original file line number Diff line number Diff line change
    @@ -30,12 +30,6 @@ + (DataManager*)sharedInstance {

    - (void)dealloc {
    [self save];

    [_persistentStoreCoordinator release];
    [_mainObjectContext release];
    [_objectModel release];

    [super dealloc];
    }

    - (NSManagedObjectModel*)objectModel {
    @@ -122,8 +116,8 @@ - (NSString*)sharedDocumentsPath {
    return SharedDocumentsPath;

    // Compose a path to the <Library>/Database directory
    NSString *libraryPath = [[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0] retain];
    SharedDocumentsPath = [[libraryPath stringByAppendingPathComponent:@"Database"] retain];
    NSString *libraryPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    SharedDocumentsPath = [libraryPath stringByAppendingPathComponent:@"Database"];

    // Ensure the database directory exists
    NSFileManager *manager = [NSFileManager defaultManager];
    @@ -144,10 +138,10 @@ - (NSString*)sharedDocumentsPath {
    }

    - (NSManagedObjectContext*)managedObjectContext {
    NSManagedObjectContext *ctx = [[[NSManagedObjectContext alloc] init] autorelease];
    NSManagedObjectContext *ctx = [[NSManagedObjectContext alloc] init];
    [ctx setPersistentStoreCoordinator:self.persistentStoreCoordinator];

    return ctx;
    }

    @end
    @end
  3. @AlexNachbaur AlexNachbaur revised this gist Apr 20, 2011. 1 changed file with 3 additions and 3 deletions.
    6 changes: 3 additions & 3 deletions DataManager.m
    View file
    Original file line number Diff line number Diff line change
    @@ -31,9 +31,9 @@ + (DataManager*)sharedInstance {
    - (void)dealloc {
    [self save];

    self.persistentStoreCoordinator = nil;
    self.mainObjectContext = nil;
    self.objectModel = nil;
    [_persistentStoreCoordinator release];
    [_mainObjectContext release];
    [_objectModel release];

    [super dealloc];
    }
  4. @AlexNachbaur AlexNachbaur revised this gist Apr 15, 2011. 1 changed file with 3 additions and 1 deletion.
    4 changes: 3 additions & 1 deletion DataManager.m
    View file
    Original file line number Diff line number Diff line change
    @@ -130,9 +130,11 @@ - (NSString*)sharedDocumentsPath {
    BOOL isDirectory;
    if (![manager fileExistsAtPath:SharedDocumentsPath isDirectory:&isDirectory] || !isDirectory) {
    NSError *error = nil;
    NSDictionary *attr = [NSDictionary dictionaryWithObject:NSFileProtectionComplete
    forKey:NSFileProtectionKey];
    [manager createDirectoryAtPath:SharedDocumentsPath
    withIntermediateDirectories:YES
    attributes:nil
    attributes:attr
    error:&error];
    if (error)
    NSLog(@"Error creating directory path: %@", [error localizedDescription]);
  5. @AlexNachbaur AlexNachbaur created this gist Apr 15, 2011.
    19 changes: 19 additions & 0 deletions DataManager.h
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,19 @@
    // DataManager.h
    #import <Foundation/Foundation.h>
    #import <CoreData/CoreData.h>

    extern NSString * const DataManagerDidSaveNotification;
    extern NSString * const DataManagerDidSaveFailedNotification;

    @interface DataManager : NSObject {
    }

    @property (nonatomic, readonly, retain) NSManagedObjectModel *objectModel;
    @property (nonatomic, readonly, retain) NSManagedObjectContext *mainObjectContext;
    @property (nonatomic, readonly, retain) NSPersistentStoreCoordinator *persistentStoreCoordinator;

    + (DataManager*)sharedInstance;
    - (BOOL)save;
    - (NSManagedObjectContext*)managedObjectContext;

    @end
    151 changes: 151 additions & 0 deletions DataManager.m
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,151 @@
    // DataManager.m
    #import "DataManager.h"

    NSString * const DataManagerDidSaveNotification = @"DataManagerDidSaveNotification";
    NSString * const DataManagerDidSaveFailedNotification = @"DataManagerDidSaveFailedNotification";

    @interface DataManager ()

    - (NSString*)sharedDocumentsPath;

    @end

    @implementation DataManager

    @synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
    @synthesize mainObjectContext = _mainObjectContext;
    @synthesize objectModel = _objectModel;

    NSString * const kDataManagerBundleName = @"MyApp";
    NSString * const kDataManagerModelName = @"MyApp";
    NSString * const kDataManagerSQLiteName = @"MyApp.sqlite";

    + (DataManager*)sharedInstance {
    static dispatch_once_t pred;
    static DataManager *sharedInstance = nil;

    dispatch_once(&pred, ^{ sharedInstance = [[self alloc] init]; });
    return sharedInstance;
    }

    - (void)dealloc {
    [self save];

    self.persistentStoreCoordinator = nil;
    self.mainObjectContext = nil;
    self.objectModel = nil;

    [super dealloc];
    }

    - (NSManagedObjectModel*)objectModel {
    if (_objectModel)
    return _objectModel;

    NSBundle *bundle = [NSBundle mainBundle];
    if (kDataManagerBundleName) {
    NSString *bundlePath = [[NSBundle mainBundle] pathForResource:kDataManagerBundleName ofType:@"bundle"];
    bundle = [NSBundle bundleWithPath:bundlePath];
    }
    NSString *modelPath = [bundle pathForResource:kDataManagerModelName ofType:@"momd"];
    _objectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:[NSURL fileURLWithPath:modelPath]];

    return _objectModel;
    }

    - (NSPersistentStoreCoordinator*)persistentStoreCoordinator {
    if (_persistentStoreCoordinator)
    return _persistentStoreCoordinator;

    // Get the paths to the SQLite file
    NSString *storePath = [[self sharedDocumentsPath] stringByAppendingPathComponent:kDataManagerSQLiteName];
    NSURL *storeURL = [NSURL fileURLWithPath:storePath];

    // Define the Core Data version migration options
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
    [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
    [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
    nil];

    // Attempt to load the persistent store
    NSError *error = nil;
    _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:self.objectModel];
    if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
    configuration:nil
    URL:storeURL
    options:options
    error:&error]) {
    NSLog(@"Fatal error while creating persistent store: %@", error);
    abort();
    }

    return _persistentStoreCoordinator;
    }

    - (NSManagedObjectContext*)mainObjectContext {
    if (_mainObjectContext)
    return _mainObjectContext;

    // Create the main context only on the main thread
    if (![NSThread isMainThread]) {
    [self performSelectorOnMainThread:@selector(mainObjectContext)
    withObject:nil
    waitUntilDone:YES];
    return _mainObjectContext;
    }

    _mainObjectContext = [[NSManagedObjectContext alloc] init];
    [_mainObjectContext setPersistentStoreCoordinator:self.persistentStoreCoordinator];

    return _mainObjectContext;
    }

    - (BOOL)save {
    if (![self.mainObjectContext hasChanges])
    return YES;

    NSError *error = nil;
    if (![self.mainObjectContext save:&error]) {
    NSLog(@"Error while saving: %@\n%@", [error localizedDescription], [error userInfo]);
    [[NSNotificationCenter defaultCenter] postNotificationName:DataManagerDidSaveFailedNotification
    object:error];
    return NO;
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:DataManagerDidSaveNotification object:nil];
    return YES;
    }

    - (NSString*)sharedDocumentsPath {
    static NSString *SharedDocumentsPath = nil;
    if (SharedDocumentsPath)
    return SharedDocumentsPath;

    // Compose a path to the <Library>/Database directory
    NSString *libraryPath = [[NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) objectAtIndex:0] retain];
    SharedDocumentsPath = [[libraryPath stringByAppendingPathComponent:@"Database"] retain];

    // Ensure the database directory exists
    NSFileManager *manager = [NSFileManager defaultManager];
    BOOL isDirectory;
    if (![manager fileExistsAtPath:SharedDocumentsPath isDirectory:&isDirectory] || !isDirectory) {
    NSError *error = nil;
    [manager createDirectoryAtPath:SharedDocumentsPath
    withIntermediateDirectories:YES
    attributes:nil
    error:&error];
    if (error)
    NSLog(@"Error creating directory path: %@", [error localizedDescription]);
    }

    return SharedDocumentsPath;
    }

    - (NSManagedObjectContext*)managedObjectContext {
    NSManagedObjectContext *ctx = [[[NSManagedObjectContext alloc] init] autorelease];
    [ctx setPersistentStoreCoordinator:self.persistentStoreCoordinator];

    return ctx;
    }

    @end