I'm still having problems migrating to a new version of my data model. I
created a small project to test migration and everything worked smoothly -- so
smoothly that trying to get it to fail wasn't easy. But, doing the same sorts
of things to migrate to a new version of the data model in my main app is
failing all over the place and I have no idea why.
I'm using versioning. I use Design > Data Model > Add Model Version. A new
version of the data model is created. I edit the unnumbered data model and
make sure it's set as the Current Model Version. To keep things simple, I've
been trying to add a single string attribute to a single entity. Build & Go
and I get:
Error Domain=NSCocoaErrorDomain Code=134130 UserInfo=0x2002a29a0 "Persistent
store migration failed, missing source managed object model.
If I delete the attribute that I just added and Build & Go again, everything
works smoothly.
All entities in the model have their own custom classes and several of those
custom entities have categories, where I've been keeping the methods.
If I'm building a managedObjectModel using -modelByMergingModels, do I need to
be doing something differently? My managedObjectModel method is below. I'll
post the -persistentStoreCoordinator method, as well, if it would help (adding
it to this email puts me over the size restriction).
Thanks.
- (NSManagedObjectModel *)managedObjectModel {
if (managedObjectModel) return managedObjectModel;
NSManagedObjectModel *prototypeModel;
// create object for prototype model
NSString *prototypePath = [[NSBundle mainBundle]
pathForResource:@"IconConfig" ofType:@"mom"];
if (prototypePath == nil) {
prototypePath = [[NSBundle mainBundle]
pathForResource:@"IconConfig" ofType:@"momd"];
}
NSLog(@"Prototype path is %@", prototypePath);
NSURL *prototypeURL = [NSURL fileURLWithPath:prototypePath];
NSLog(@"Prototype URL is %@", prototypeURL);
prototypeModel = [[NSManagedObjectModel alloc]
initWithContentsOfURL:prototypeURL];
if (!prototypeModel) {
NSLog(@"prototype model couldn't be found.");
}
// create object for media resouces model
NSString *resourcesPath = [[NSBundle mainBundle]
pathForResource:@"MediaResources" ofType:@"mom"];
if (!resourcesPath) {
return nil;
}
NSURL *resourcesURL = [NSURL fileURLWithPath:resourcesPath];
NSManagedObjectModel *resourcesModel = [[NSManagedObjectModel alloc]
initWithContentsOfURL:resourcesURL];
// create merged model
managedObjectModel = [NSManagedObjectModel
modelByMergingModels:[NSArray arrayWithObjects:prototypeModel, resourcesModel,
nil]];
return managedObjectModel;
}
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