What's the preferred approach for constantly sharing data across threads when using Core Data? I am downloading a large file and want to show progress of the download in a UIProgressBar. The actual download is happening in a background thread created by NSOperation. The download information (local path, total bytes, bytes received) is ...
Thanks for the help. I have a woking Core Data doc based app. that solely supports SQLITE docs. I would like to distribute the application with a previously created database document with predefined data embedded in the application bundle. How do I instruct the application to run the embedded file at runtime? thanks. -paul. ...
It looks like the recent Xcode 3.2 has added some code generation niceties that (I think) were lacking pre-Snow Leopard. I took the following steps: Define a simple .xcdatamodel model with a few entities, including one (inversible) one:many relationship (an Endpoint has many Subscription objects) File -> New and select the (icon-less)...
Hi there, I saw your post at: http://stackoverflow.com/questions/928177/provide-base-data-for-core-data-application I'd like to follow your steps to load Core Data, preferably from a csv or something. I don't have my data in an sql database yet. if you have time, can you help? thanks! asUwish ...
I use two PersistenceStores one for saving phone setting related entities and Other for saving User details related entities. I need to clear all the User details related entity on log off , so i delete the userdetails.sqlite using [NSFileManager removeItemAtPath: error:] method. After this i setup the managedobjectcontext but i am not...
I am using Apple's CoreDataBooks sample application as a basis for pulling data into a secondary managed object context in the background, and then merging that data into the primary managed object context. The data I am pulling in is a Book entity with a to-one relationship with an Owner entity (called "owner"). The Owner entity has a ...
I have a NSManagedObject subclass, created by the XCode model interface. This class has some NSString and NSNumber members, and a NSDate member. When I try to set the NSDate member, I get the following exception: 2009-10-12 21:53:32.228 xxx[2435:20b] Failed to call designated initializer on NSManagedObject class 'Item' 2009-10-12 21:53:...
So I'm working on a clone of CoreDataBooks. It's a little different. When the '+' button is pushed, it launches a navController, containing 2 views. The first (AddPatientVC) asks for name of the Patient then its pushed to a 2nd View Controller (AddPatientDetailVC) which asks for more detailed information. It's the 2nd view controller th...
I have an iPhone app that uses Core Data. I did an update and used Lightweight Migration to go from V1 to V2 of my MOM (Managed Object Model). This worked perfectly. What happens when I want to go to V3 (and beyond) of my MOM? If I decide to continue with Lightweight Migration, will it automatically deal with migrating from V1 to V3...
I need some guidance on how to save video data to core data so that I can retrieve it again later. I have no problem retrieving the NSURL that is returned from UIImagePickerController but then I'm not sure how to go about saving the video data to Core Data. I can already save and retrieve regular images from Core Data but I'm not sure h...
I've got an NSFetchedResultsController as my data source and and I implement NSFetchedResultsControllerDelegate in my custom UITableViewController. I'm using sectionNameKeyPath to break my result set into multiple sections. In one of my methods, I'm adding a couple of objects to the context, all of which are in a new section. At the m...
I'm encountering a very annoying error using Core Data on Mac OS X 10.5. All entities have classes in my application which share the same names. Up to this point, I've done 5 migrations without problems. I'm using the XML data store. I've got V5 of my data model with 13 entities, 4 of which are abstract. It looks like this: What I d...
I am new to Core Data. I have noticed that collection types are not available as attribute types and would like to know what the most efficient way is of storing array/dictionary type data as an attribute (e.g. the elements that make up an address like street, city, etc. does not require a separate entity and is more conveniently stored ...
Hi there, I'm about to create a series of NSOperations and run them in a queue. They will all be sequential and run one at a time. These operations will fetch data from the web and create and save core data managed objects. How do I handle the situation where the application exits? As the operations run in detached threads, how can I...
Cocoa newbie here. I am working on an iPhone UITableViewController-based widget that can be used to edit date and text properties in an object set during initiation. Currently, I am attempting to do this with a @selector and NSInvocation as below. Note: the "targetObject" is the object set when the controller is initialized. - (IBAct...
Hi, I recently downloaded Apple's sample app CoreDataBooks and for the sake of learning decided to add a cell to the last record in the RootViewController.m table view, which would display the number of records that were fetched. The code I added is shown below. I didn't get to the point of adding the fetch count because I am getting b...
Hello to everyone, I cannot understanding why values assign to array objects become "disordered" after executing executeFetchRequest. Well, I'm not certain that fetching is the problem here. Here's the code. objects=[NSArray arrayWithObjects:@"a",@"b",@"c",@"d",@"e",nil]; NSManagedObject *DB = nil; for (int i=0;i<[objects count];i+...
I need to make a duplicate of an existing object graph from one NSManagedObjectContext and insert it into a second NSManagedObjectContext. Is there a straightforward way to do this? From what I can tell I could ask the MOC for its -registeredObjects and then do something like this to copy the attributes: NSString* entityName = [[...
I have set up a Core Data model where I have two objects, say Person and Address. A person has an address, and an address can belong to many people. I have modelled it in core data as such (so the double arrow points to Person, while the single arrow goes to Address) I have then created two classes for those objects, and implemented som...
I have the need to create a complex predicate for an abstract base object. I want to have separate predicate queries for different inheriting entities and key off the sub-entity type, the example below is what I would like to do, however, I have not been able to find a way to reference the entity name or type in the predicate. NSFetchR...