I have a project and I want to add the Core Data handling. I have read a lot of documents and questions on the internet and on this site, but I have an error and I can't fix it.
Basically, I use for the implementation this site: http://www.theappcodeblog.com/2011/08/08/add-core-data-to-an-existing-project-in-xcode-4/ and I created a new project with core data supporting in xcode for helping me in my project. But I cant copy my project code to the core data supported xcode project.
So I have the coredata framework included, and imported in the pch file. AppDelegate.m and .h files are has the core data functions and properties.
I created a xcdatamodeld with name "User.xcdatamodeld" and with the class file which name User.h and User.m
When I try to start my application I got this error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Cannot create an NSPersistentStoreCoordinator with a nil model'
The error come from the managedObjectModel getter method line, where the managedObjectModel is null.
I have tried to some another thing, for example, replace the line:
managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
to:
managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain];
but with this line I got this error:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
With the first line, I debugged the modelURL and the debug line ends is: /diary.app/User.momd/
The User.momd dir is exist and has a User.mom file.
My question is same like that: Cannot create an NSPersistentStoreCoordinator with a nil model But the momd to mom replacing not works for me.
So what I doing wrong?
Many thanks!
EDIT
I found the solution (my weekend day was gone...):
start a new project with core data, and full copy the appdelegate functions and properties. Only this works for me!
