Core Data helpers

gistfile1.swift

    func fetchAll<T:NSManagedObject>(type:T.Type, predicate:NSPredicate?, sorts:[AnyObject]?=nil)->[T]{
        let entityName = NSStringFromClass(type);
        let request = NSFetchRequest(entityName:entityName);
        request.predicate = predicate;
        request.sortDescriptors = sorts;
        var error:NSError?=nil;
        if let rows = context.executeFetchRequest(request, error:&error) {
            return rows as [T];
        }else{
            DDLogError("\(error)");
            return [T]();
        }
    }
    
    func fetchRow<T:NSManagedObject>(type: T.Type, predicate:NSPredicate?, sorts:[AnyObject]?=nil)->T?{
        assert(NSThread.isMainThread());
        let request = NSFetchRequest(entityName:NSStringFromClass(T));
        request.predicate=predicate;
        request.sortDescriptors = sorts;
        request.fetchLimit=1;
        var error:NSError?=nil;
        if let rows = context.executeFetchRequest(request, error:&error) {
            return rows.first as? T;
        }else{
            DDLogError("\(error)");
            return nil;
        }
    }
    

using:
let sort = NSSortDescriptor(key:"lastName", ascending:true);
let users = fetchAll(BMUser.self, predicate: predicate, sorts: [sort]);