核心數據不支持iOS 5

Question

五，iOS 5

我有我的Model2.xcdatamodelId包含2個實體。我的模型被命名爲2，因爲我已經有一個名爲Model的Singleton用於某些管理。

因此，我有Model2.h和Model2.m。

我的問題：第一次，我的模型2初始化，我把一些默認數據，然後我提交。它工作的很好，它說我的Model2已經被正確保存了。在我正在閱讀我的數據之後，數據從數據庫中顯示出來，所以它在數據庫中是成功的。 但是，當關閉並殺死我的應用程序，我的應用程序似乎已經失去了所有數據..並重新創建默認數據，因爲它是空的...

提示：我想我的問題可能大約初始化.. whithin這些線路：

NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString* basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 
NSURL * storeUrl = [NSURL fileURLWithPath: [basePath stringByAppendingPathComponent: @"ProjectXYZ.db"]]; 

由於ProjectXYZ.db不存在，它應該創建它..這就是我迷路了部分..但它？似乎在另一個項目上工作...：S

這裏是我的Model2.h

#import <CoreData/CoreData.h> 
#import "Photos_Trophies.h" 
#import "Trophies.h" 

@interface Model2 : NSObject 


// High-level methods. 
+ (void) commit; 

... 

// Object Retrieval 
+ (NSArray*) trophies; 

... 

// Object Creation 
+ (id) trophiesWithTitle:(NSString *)title; 

@end 

而且我Model2.m

#import "Model2.h" 
#import <UIKit/UIKit.h> 

static NSManagedObjectContext * ctx; 

@implementation Model2 


+ (void) initialize { 

    NSArray * paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString* basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 
    NSURL * storeUrl = [NSURL fileURLWithPath: [basePath stringByAppendingPathComponent: @"ProjectXYZ.db"]]; 
    NSError * error = nil; 

    ctx       = [[NSManagedObjectContext alloc] init]; 
    ctx.persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[NSManagedObjectModel mergedModelFromBundles:nil]]; 
    ctx.undoManager    = [[NSUndoManager alloc] init]; 

    if (![ctx.persistentStoreCoordinator addPersistentStoreWithType:NSInMemoryStoreType configuration:nil URL:storeUrl options:nil error:&error]) { 
     NSLog(@"%@", error); 
    } 

    //TEMPORARY... these are default trophies for example 
    if ([[Model2 trophies] count] == 0) { 

     [self trophiesWithTitle:@"Saved Trophy Test 1"]; 
     [self trophiesWithTitle:@"Saved Trophy Test 2"]; 
     [self trophiesWithTitle:@"Saved Trophy Test 3"]; 

     [self commit]; 
    } 
} 

+ (void) commit { 
    NSError* error = nil; 

    if (![ctx save:&error]) { 
     NSLog(@"ERREUR DANS COMMIT: %@", error.localizedDescription); 

     NSArray* detailedErrors = [[error userInfo] objectForKey:NSDetailedErrorsKey]; 
     if(detailedErrors && [detailedErrors count] > 0) { 
      for(NSError* detailedError in detailedErrors) 
       NSLog(@"DetailedError: %@", [detailedError userInfo]); 
     } else 
      NSLog(@"%@", [error userInfo]); 
    } else 
     NSLog(@"Model2 SAVED"); 
} 

+ (NSArray*) trophies { 
    NSFetchRequest* req = [[NSFetchRequest alloc] init]; 
    req.entity   = [NSEntityDescription entityForName:@"Trophies" inManagedObjectContext:ctx]; 
    req.sortDescriptors = [NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"trophies_title" ascending:YES]]; 
    NSError* error  = nil; 
    NSArray* objects = [ctx executeFetchRequest:req error:&error]; 

    return objects; 
} 

+ (id) trophiesWithTitle:(NSString *)title { 
    Trophies * trophies = [NSEntityDescription insertNewObjectForEntityForName:@"Trophies" inManagedObjectContext:ctx]; 
    trophies.trophies_title = title; 

    return trophies; 
} 

Answer 1

你的問題是這樣的：NSInMemoryStoreType您需要使用持久的支持聖礦石。

做這樣的事情：

NSURL *storeUrl = [NSURL fileURLWithPath:[self persistentStorePath]]; 

NSError *error = nil; 
persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; 

NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: 
         [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, 
         [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; 

if (![persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType 
               configuration:nil 
                 URL:storeUrl 
                options:options 
                 error:&error]) { 
    /* 
    Replace this implementation with code to handle the error appropriately. 

    abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. If it is not possible to recover from the error, display an alert panel that instructs the user to quit the application by pressing the Home button. 

    Typical reasons for an error here include: 
    * The persistent store is not accessible 
    * The schema for the persistent store is incompatible with current managed object model 
    Check the error message to determine what the actual problem was. 
    */ 
    NSLog(@"Unresolved error %@, %@", error, [error userInfo]); 
    NSAssert(error == nil, @"error creating persistentStoreCoordinator"); 
}