CoreDataHelper.swift

//
//  CoreDataHelper.swift
//  challenme
//
//  Created by Fangyi Chen on 4/26/15.
//  Copyright (c) 2015 Fangyi Chen. All rights reserved.
//

import UIKit
import CoreData

class CoreDataHelper: NSObject {
    class func insertManagedObject(className:NSString, managedObjectContext:NSManagedObjectContext) -> AnyObject {
        let managedObject = NSEntityDescription.insertNewObjectForEntityForName(className as String, inManagedObjectContext: managedObjectContext) as! NSManagedObject
        return managedObject
    }
    
    class func fetchEntities (className:NSString, managedObjectContext:NSManagedObjectContext, predicate:NSPredicate?)->NSArray{
        let fetchRequest = NSFetchRequest()
        let entetyDescription = NSEntityDescription.entityForName(className as String, inManagedObjectContext:managedObjectContext)
        
        fetchRequest.entity = entetyDescription
        
        if predicate != nil {
            fetchRequest.predicate = predicate!
        }
        
        fetchRequest.returnsObjectsAsFaults = false
        
        let items = managedObjectContext.executeFetchRequest(fetchRequest, error:nil)!
        
        return items
    }

   
}