could not locate an NSManagedObjectModel for entity name "X"

Question

I have this crash error : * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'JourneeDeTravail''

My AppDelegate.h :

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate> {
NSManagedObjectModel *managedObjectModel;
NSManagedObjectContext *managedObjectContext;     
NSPersistentStoreCoordinator *persistentStoreCoordinator;
UIWindow *window;
UINavigationController *navigationController;
}

@property (strong, nonatomic) UIWindow *window;
@property (nonatomic, retain) UINavigationController *navigationController;
@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator          *persistentStoreCoordinator;

- (NSURL *)applicationDocumentsDirectory;
- (void)saveContext;
@end

My AppDelegate.m :

#import "AppDelegate.h"
#import "TableViewController.h"
#import "ViewController.h"

@implementation AppDelegate

@synthesize window;
@synthesize navigationController;
@synthesize managedObjectContext =_managedObjectContext;
@synthesize managedObjectModel =_managedObjectModel;
@synthesize persistentStoreCoordinator=_persistentStoreCoordinator;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
ViewController *viewController = [[ViewController alloc] init];
viewController.managedObjectContext = [self managedObjectContext];
NSLog(@"AppDelegate VC: %@",  managedObjectContext);
return YES;
}

- (void)dealloc {
[super dealloc];
}

@end

And a ViewController.h :

#import <UIKit/UIKit.h>
#import <CoreData/CoreData.h>
#import "AppDelegate.h"

@interface ViewController : UIViewController{
NSManagedObjectContext *managedObjectContext;
}
@property (retain, nonatomic) IBOutlet UILabel *displayStart;
@property (retain, nonatomic) IBOutlet UILabel *displayEnd;
@property (retain, nonatomic) IBOutlet UITextField *displayResult;
@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;

- (IBAction)SaveTest:(id)sender;

@end

And ViewController.m :

#import "ViewController.h"

@implementation ViewController
@synthesize managedObjectContext;

- (void)viewDidLoad {    
if (managedObjectContext == nil) { 
    managedObjectContext = [(AppDelegate *)[[UIApplication sharedApplication] delegate]managedObjectContext];
    NSLog(@"After managedObjectContext VC: %@",  managedObjectContext);
}
}

- (IBAction)SaveTest:(id)sender {
NSLog(@"Dans SaveTest : %@",  managedObjectContext);
NSLog(@"Context: %@",managedObjectContext);
NSLog(@"PS Coord : %@",managedObjectContext.persistentStoreCoordinator);
NSLog(@"MOM : %@", managedObjectContext.persistentStoreCoordinator.managedObjectModel);
NSLog(@"Entities : %@",  [[managedObjectContext.persistentStoreCoordinator.managedObjectModel entities] valueForKey:@"JourneeDeTravail"]);
JourneeDeTravail *journee = (JourneeDeTravail *)[NSEntityDescription insertNewObjectForEntityForName:@"JourneeDeTravail" inManagedObjectContext:managedObjectContext];
}

But when I press SaveTest button it crashes with error log saying all my log lines are (null).

Of course I have an Entity called JourneeDeTravail...

Any idea ? Looks like I don't have a managedObjectContext but I don't know what to do to fix that. Thanks for your help !

Answer 1

Just for those of you who have the same problem : I found the solution when I did this tutorial : http://www.techotopia.com/index.php/An_iOS_5_iPhone_Core_Data_Tutorial