App Freeze when delete a entity with many relationships (cascade delete)

http://stackoverflow.com/questions/37787092/ios-app-freeze-when-delete-entity-with-magical-record

I am using MagicalRecord framework to “clean up” Core Data code. When the app launch or resume from background, the program will try to clean up some data with the following code:

[MagicalRecord saveWithBlock:^(NSManagedObjectContext localContext) { NSDate date = [[NSDate date] dateByAddingTimeInterval:-259200];

NSFetchRequest *request = [NGCOwner MR_requestAllSortedBy:@"updatedTime" ascending:YES withPredicate:[NSPredicate predicateWithFormat:@"updatedTime < %@", date]];

NSArray *results = [NGCOwner executeFetchRequest:request inContext:localContext];

NSInteger count = MAX(0,[results count]-100); //do not delete the lastest 100 results

for (NSInteger i = 0; i < count; i++) {
    NGCOwner *owner = [results objectAtIndex:i];
    if([userId isEqualToString:owner.userId]){
        continue;
    }
    [localContext deleteObject:owner];
}

}]; The entity "NGCOwner" has 17 relationships and set the delete rule to Cascade. When the program delete the NGCOwner entity (approx. 170 NGCOwner), it makes the NSPersistentStoreCoordinator busy and freeze the app.

Can I force NSPersistentStoreCoordinator not to execute in main thread?

magicalpanda / MagicalRecord

App Freeze when delete a entity with many relationships (cascade delete) #1242