@implementation NSManagedObject (TCCreation)
+ (instancetype)tc_insertIntoContext:(NSManagedObjectContext*)ctx
{
    for(NSEntityDescription *desc in [ctx.persistentStoreCoordinator.managedObjectModel entities]) {
        if([desc.managedObjectClassName isEqual:NSStringFromClass(self)]) {
            return [[self alloc] initWithEntity:desc insertIntoManagedObjectContext:ctx];
        }
    }
    NSAssert(NO, @"This class does not exist in the managed object model for %@", ctx);
    return nil;
}
@end