NSManagedObject+Sugar

CoreData syntactic sugar

an NSManagedObject category providing a sweeter way to use CoreData

Example:

#import "NSManagedObject+Sugar.h"

...

    // create a new instance of a core data entity
    MyEntity *entity = [MyEntity managedObject];

    // fetch all stored instances of an entity
    NSArray *a = [MyEntity allObjects];

    // fetch instances matching a predicate query
    a = [MyEntity objectsMatching:@"attribute == %@", @"value"];

    // fetch all instances, sorted by attribute
    a = [MyEntity objectsSortedBy:@"attribute" ascending:YES];

    // fetch instances using a custom fetch request
    NSFetchRequest *req = [MyEntity fetchRequest];

    req.predicate = [NSPredicate predicateWithFormat:@"attribute != %@", @"value"];
    req.sortDescriptors = @[[NSSortDescriptor sortDescriptorWithKey:@"attribute" ascending:YES]];
    a = [MyEntity fetchObjects:req];
    
    // count how many stored instances of an entity exist
    NSUInteger count = [MyEntity countAllObjects];
    
    // count how many instances match a predicate query
    count = [MyEntity countObjectsMatching:@"attribute == %@", @"value"];

    // thread safe valueForKey:
    id value = entity[@"attribute"];

    // thread safe setValue:forKey:
    entity[@"attribute"] = value;        

    // delete an instance of an entity
    [entity deleteObject];
    
    // persist changes (this also happens automatically when the app terminates)
    [NSManagedObject saveContext];
    
...