在NSManagedObject上调用MR_createEntity时出错

Question

当我简单地调用MR_createEntity时，我得到一个exc_bad_access错误。由于我是magicalRecord的新手，我无法找到bug的来源。

代码：

TMTAppDelegate.m

//TMTAppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

    [MagicalRecord setupAutoMigratingCoreDataStack];



    NSArray *trajetsRawArray = @[@{@"km" : @125, @"mn":@110, @"adressStart" : @"Metz", @"adressEnd" : @"Gérardmer", },
                                 @{@"km" : @4, @"mn":@14, @"adressStart" : @"Plappeville", @"adressEnd" : @"Metz"},
                                 @{@"km" : @312, @"mn":@200, @"adressStart" : @"Metz", @"adressEnd" : @"Paris"},
                                 @{@"km" : @413, @"mn":@236, @"adressStart" : @"Marseille", @"adressEnd" : @"Toulouse"},
                                 @{@"km" : @2, @"mn":@4, @"adressStart" : @"Ban-St-Martin", @"adressEnd" : @"Metz"},
                                 @{@"km" : @65, @"mn":@63, @"adressStart" : @"Metz", @"adressEnd" : @"Gérardmer"}
                                 ];

    //[[UINavigationBar appearance] setBackIndicatorImage:[UIImage imageNamed:@"backButton"]];
    self.trajetsManager = [[TMTTrajetsManager alloc]initWithArray:trajetsRawArray];
    NSLog(@"hello");
    return YES;
}

TMTTrajetsManager.m

//  TMTTrajetsManager.m
-(id)initWithArray:(NSArray *)array {

    self = [super init];
    if (self){
        for (NSDictionary *trajetDico in array){

            Trajet *trajet = [Trajet MR_createEntity];
            trajet.distance = [trajetDico objectForKey:@"km"];
            trajet.duration = [trajetDico objectForKey:@"mn"];
            trajet.start_point = [trajetDico objectForKey:@"adressStart"];
            trajet.end_point = [trajetDico objectForKey:@"adressEnd"];
            self.autoManager = [[TMTTrajetAutoManager alloc] initWithDelegate:self];
        }
    }

    return self;
}

错误：

Answer 1

禁用MR_SHORTHAND，并明确使用带有MR_前缀的方法名称。看起来这种方法通过速记支持识别出这种方法存在。现在不推荐使用速记支持，它将是MagicalRecord的removed in the next version。