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Core data object id format


Core data object id format

By : Maxim Priyatkin
Date : November 21 2020, 04:01 AM
it helps some times The p identifies the objectID as persistent, associated to its MOC. It is part of the whole URI.
Temporary URIs look different, e.g.: x-coredata:///Facility/tF1697911-CD8A-4D63-B40F-AB0CA020C873 notice the "t" in front of the objectID.
code :


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Creating a New Core Data Object If It Does Not Exist, or Obtaining an Existing Object if it Does Exist with Core Data

Creating a New Core Data Object If It Does Not Exist, or Obtaining an Existing Object if it Does Exist with Core Data


By : Jesse Ben Benjamin
Date : March 29 2020, 07:55 AM
To fix this issue Ok this is what is happening... U add first transaction and for a name U provide Jack, then U add second transaction (T further in text) and add name John, after U add third T with name Jack and add another with name John. If U take a look at the tables in the database you will see that Transitions table has 4 entries cause You added 4 transitions, but Persons has only two. It has 2 cause you added a filter on Persons input so that it cannot contain two same names. And the mistake you made is that U tried to fetch from Transition table all entries. Of course U get 4 names (2 Johns and 2 Jacks) cause there R 4 entries in Transition table and each is associated with a Person record. If U want to fetch all persons you shouldn't fetch it from the Transition table, you should do it from Persons table OR you should add [r setReturnsDistinctResults:YES]; on your fetch request in case U R fetching from Transition table... I think there is a way to set distinct by which property but I don't know the syntax. So the problem is really in what do You want to do, do you want to present all the persons U have in your database, or you want to present names on your transitions which means that same people could have made different transitions. See...
Excessive memory footprint when storing JSON (as NSData) on Core Data Object via ARC in Core Data

Excessive memory footprint when storing JSON (as NSData) on Core Data Object via ARC in Core Data


By : M.Mott
Date : March 29 2020, 07:55 AM
help you fix your problem Try wrapping the NSJSONSerialization call in an @autoreleasepool, it creates a ton of autoreleased objects that aren't needed after the call.
As for what you're doing, storing them as NSData will incur the same memory footprint in CoreData as storing them in their own file. You'll pay a bit more per object for the stuff required by NSManagedObject but the net cost is approximately the same.
why the file in core data still there although i can delete object successfully in core data

why the file in core data still there although i can delete object successfully in core data


By : DexinLi
Date : March 29 2020, 07:55 AM
should help you out i found a problem, i didn't remove the file by my own. so i have to remove the data file before remove the information inside the data base:
code :
    var baseString : String = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)[0] as String
    println("baseString: \(baseString)")


    var pathComponents = [baseString, sound.url]

    var fileManager:NSFileManager  = NSFileManager.defaultManager()
    var fileURL = NSURL.fileURLWithPathComponents(pathComponents)!


    fileManager.removeItemAtURL(NSURL.fileURLWithPathComponents(pathComponents)!, error: nil)
Fetch Core Data object from UITableViews not made from Core Data

Fetch Core Data object from UITableViews not made from Core Data


By : Rex_trick
Date : March 29 2020, 07:55 AM
To fix this issue If you are populating your array from a static array, then you probably don't need to use a fetched results controller. You should instead just execute a fetch to get the relevant NSManagedObject. To ensure the fetch gets only the relevant object, use a predicate.
Suppose your NSManagedObjects are in a Publication Entity, and the relevant attribute is title. You should build a fetch like this:
code :
NSManagedObjectContext *context = self.managedObjectContext; // or however your context is obtained
NSManagedObject *selectedObject;
NSFetchRequest *fetch = [NSFetchRequest fetchRequestWithEntityName:@"Publication"]; // amend entity name as appropriate
fetch.predicate = [NSPredicate predicateWithFormat:@"title == %@",pubNumber];
NSError *error;
NSArray *results = [context executeFetchRequest:fetch error:&error];
if (results == nil) {
    NSLog(@"Fetch error %@, %@", error, [error userInfo]);
    abort();
} else {
    if ([results count] == 0) {
        NSLog(@"Publication not found");
    } else {
        // (note, should probably also check for count > 1 and handle accordingly)
        selectedObject = results[0];
        // then carry on with the remaining code from loadPublicationLocally....
        NSString *phrase = nil; // Document password (for unlocking most encrypted PDF files)
        NSString *filePath;
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"PDFs"];
        filePath = [filePath stringByAppendingPathComponent:[selectedObject valueForKey:@"puburl"]]; assert(filePath != nil); ;
        // ... etc etc.
    }
}
IOS/Objective-C/Core-Data: Does new Core Data object come with relationship objects?

IOS/Objective-C/Core-Data: Does new Core Data object come with relationship objects?


By : Dmitry Tuzenkov
Date : March 29 2020, 07:55 AM
I wish this helpful for you
My question, is whether I also have access to "phantom" or uninstantiated managedobjects of the entitites with which my object has a relationship? Or do I need to create properties in the object file for each and every attribute.
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