Ok so this is the error I'm getting
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '"Place" is not a subclass of NSManagedObject.'
I assume that what it means is that 'Place' hasn't been added as an entity to the core data model??? But it has as shown by the image below.
I'm guessing that my assumption is incorrect though so any help or ideas would be nice.
I'm pretty certain that this is the line that's causing it:
NSManagedObject* place = [NSEntityDescription
insertNewObjectForEntityForName:#"Place"
inManagedObjectContext:context];
If you aren't using custom classes (no Place.[hm]), as it sounds like you're not, check the Entity tab, and make sure the Class name is blank (= NSManagedObject) – not Place.
I had the same problem with classes called Message and Connection. The error just appeared after adding an emailing facility using the MessageUI library. I believe the conflict occurs because the library will have classes named Message and Connection, therefore they are not seen to be subclasses of NSManagedObject. Changing their names by prefixing (in my case with an X) makes the entities unique. I intend prefixing all my entities in future so that there is less chance of the conflict arising.
The first thing to do when you encounter this kind of errors is to verify the class name of your entity :
Open XCDataModel
Select your entity
Open the right pane Utilities
Click on "show the data model inspector" button
Verify the class name so that it's in sync with your generated model
Hope this helps !
The other way to address this issue is to indeed use the NSManagedObject subclass (recommended).
Place *place = [NSEntityDescription
insertNewObjectForEntityForName:#"Place"
inManagedObjectContext:context];
Related
When i call the method:
- (void)removeObjectFromMediaAtIndex:(NSUInteger)idx;
which is one of the default methods in a file created as a core data object, i'm getting an error of unrecognized selector sent to instance. Anybody know why this might be happening?
Ensure that your NSManagedObject sublcass instance was created using an NSManagedObjectContext and not directly. Instead of leveraging #synthesize for properties, NSManagedObject sublcasses leverage the #dynamic keyword which indicates the accessors will be created at runtime - in this case, by the NSManagedObjectContext. They will not be there if you create the object instance using something like alloc]init];
It is a notorious Core Data bug. It is almost 2-year old but sadly it is still there. See this post: Exception thrown in NSOrderedSet generated accessors.
It sounds like you may have altered your data model without altering the classes, or vice-versa. Or perhaps one of your team members did (my team quickly learned about this danger). Another possibility is that the reference you are using is not actually the class you think it is. Sometimes if you overrelease an object, another object will occupy the previous memory space but it will not be the correct class.
However, this doesn't look like a default method. The default methods I am used to seeing are add object, remove object, change to a new NSSet, and one more that I can't quite remember off the top of my head. However, if you got the CoreData object to use an NSArray instead it would make sense.
I got the following error when deleting an object from my app. Any ideas on how to fix it?
I'm still trying to recreate the process to find out exactly where it is crashing.
Serious application error. Exception was caught during Core Data change processing. This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification. CoreData could not fulfill a fault for '0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1>' with userInfo {
NSAffectedObjectsErrorKey = (
"<Session: 0x6f7c830> (entity: Session; id: 0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1> ; data: <fault>)"
);
*** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'CoreData could not fulfill a fault for '0x5adc8b0 <x-coredata://2B90C6EC-E046-4508-A1B1-6C4B19BF830D/Session/p1>''
A) If you are subscribing to save notifications, Core Data is pointing to a failure there.
B) The "could not fulfill a fault" message is often related to deleting an object, after which some other part of your app tries to access ANY property on it. Yes, even ones where faults were previously fulfilled. The whole object is unusable after a delete.
This occurred in my code when I passed a managed object down to a custom NSOperation class. My NSOperation would load other objects through its to-many relationship, process them, then delete those objects. If it tried to do a search on more objects in the to-many relationship, it would sometimes crash with the "CoreData could not fulfill a fault" exception. Then I remembered reading about "thread confinement" in the Core Data Programming Guide so I changed my code to pass a key down to my NSOperation class. The NSOperation class would then do its own search in its own context to find its own instance of the core data class. I stopped getting the exception after that. (I still have to use save notifications.)
I'm relatively well versed in CoreData and have been using it for several years with little or no difficulty. For the life of me, I can't figure out why
insertNewObjectForEntityForName:inManagedObjectContext:
is all of a sudden returning some sort of strange instance of NSNumber. GDB says the returned object is of the correct custom subclass of NSManagedObject, but when I go to print a description of the NSManagedObject itself, I get the following error:
*** -[NSCFNumber objectID]: unrecognized selector sent to instance 0x3f26f50
What's even stranger, is that I'm able to set some relationships and attributes using setValue:forKey: and all is good. But when I try to set one specific relationship, I get this error:
*** -[NSCFNumber entity]: unrecognized selector sent to instance 0x3f26f50
I've tried everything from clean all targets, to restarting both mac and iPhone, even editing the model so that the relationship in question is to-one instead of to-many. No matter what I do, the same problem appears. Has anyone ever seen anything like this before?
I had the very same issue: I had added a method called "isDatabase" (returning a BOOL) to the parent entity of my Database entity, which had a relationship named "database". Renaming "isDatabase" to "isOfTypeDatabase" fixed the issue. So keep also looking in parent entities!
I defined a property on an NSManagedObject subclass that collided with the name of a relationship defined on the class.
Here's the code in my MyManagedObjectSubclass+Custom.h
#property (readonly, nonatomic) BOOL isSeason;
Here's the code produced by XCode for MyManagedObjectSubclass.h
#property (nonatomic, retain) SomeOtherEntityToOneRelationship *season;
Note that isSeason, by KVC, will collide with the season name
I ran into the exact same problem and after pulling my hair out for an entire day, I solved my problem.
I believe the problem is related to a corrupt attribute / relationship, and the NSCFNumber is actually looking for the objectID for that attribute / relationship. In my case, I could use valueForKey: to find all of the attributes / relationships, although a relationship I had called "file" seemed to be corrupt.
I finally realized that I had extended NSObject to include a boolean "isFile" method, and somehow this was interfering with CoreData and causing it to either return a corrupt object, or not be able to deal properly with the object it had. My guess is that CoreData must dynamically create "isXXX" methods.
I could either fix the problem by removing the isFile method, or by renaming my property.
The objectID and entity selectors are on NSManagedObject, not NSCFNumber (or NSNumber). I wouldn't expect you to call either of these selectors on a NSNumber which should be a property on an entity, not the entity itself.
Every entity in CoreData must extend NSManagedObject, so your NSCFNumber object is not an entity.
I'm following this how-to to implement Core Data storage in my app:
I have a Model.xcdatamodel which defines a Something model. I've used XCode to generate a class for that model.
I've imported the class in my .m file where I'm trying to:
Something* s = (Something *)[NSEntityDescription insertNewObjectForEntityForName:#"Something" inManagedObjectContext:managedObjectContext];
But this causes the following error:
2009-10-13 21:18:11.961 w9a[4840:20b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Something''
Am I missing something?
Personally, I prefer the following method:
// With some NSManagedObjectContext *context
NSEntityDescription *desc = [NSEntityDescription entityForName:#"Something"
inManagedObjectContext:context];
Something *s = [[[Something alloc] initWithEntity:desc
insertIntoManagedObjectContext:context] autorelease];
I've noticed it's less prone to random Core Data errors, and is easier to debug. It's effectively doing the same thing as your code, but explicitly gets an entity description first, so you can debug that separately if need be.
Seems that you dont have a NSManageObject named "Something" in your object model...are you making your entity in the object model? I am not sure if you need to generate the code as well, but you can have xcode do that for you automatically by clicking on the entity, saying new, and selecting Managed Object from the menu there
Found my problem, the NSManagedObjectContext was not geting initialized properly for some reason. I've re-written that code following the how-to and now it seems to work.
Thanks anyway :)
This question has something to do with the question I posted here: Iphone Core Data crashing on Save
however the error is different so I am making a new question. Now I get this error when trying to insert new objects into my managedObjectContext:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException',
reason: '"MailMessage" is not a subclass of NSManagedObject.'
But clearly it is:
#interface MailMessage : NSManagedObject { ....
And when I run this code:
NSManagedObjectModel *managedObjectModel = [[self.managedObjectContext
persistentStoreCoordinator] managedObjectModel];
NSEntityDescription *entity =[[managedObjectModel entitiesByName]
objectForKey:#"MailMessage"];
NSManagedObject *newObject = [[NSManagedObject alloc] initWithEntity:entity
insertIntoManagedObjectContext:self.managedObjectContext];
It runs fine when I do not present an MFMailComposeViewController, but if I run this code in the
- (void)mailComposeController:(MFMailComposeViewController*)controller
didFinishWithResult:(MFMailComposeResult)result error:(NSError*)error {
method, it throws the above error when creating the newObject variable.
The entity object when I use print object produces the following:
(<NSEntityDescription: 0x1202e0>) name MailMessage, managedObjectClassName MailMessage,
renamingIdentifier MailMessage, isAbstract 0, superentity name (null), properties {
in both cases, so I don't think the managedObjectContext is completely invalid. I have no idea why it would say MailMessage is not a subclass of NSManagedObject at that point, and not at the other.
Any help would be appreciated, thanks in advance.
Class MailMessage could be implemented in a library or somewhere else in the framework. As Objective C does not implement namespaces, one of the two will be used. Which one is undefined. Try giving your class a different name to quickly resolve the issue.
Look for a message like this from the debugger. It will confirm what Benjamin says.
Class MailMesssage is implemented in both /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator4.2.sdk/System/Library/PrivateFrameworks/Message.framework/Message and /Users/home/Library/Application Support/iPhone Simulator/4.2/Applications/FFFFFFFF-FFFF-0000-0000-AAAAAAAAAAA/Projects.app/Projects. One of the two will be used. Which one is undefined.
Try resetting the Simulator or uninstalling the application from your device. Often the NSInternalInconsistencyException has to do with problems with changing the datamodel and the database not being updated accordingly.
I was able to workaround this by creating the MailMessage object before presenting the modal view controller. Once the MailMessage object was already created, saving changes did not present a problem. A strange workaround and not addressing the actual problem as far as I know, but it works.