61 lines
1.8 KiB
Swift
61 lines
1.8 KiB
Swift
//
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// NSManagedObject+Conveniences.swift
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// Delta
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//
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// Created by Riley Testut on 10/4/15.
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// Copyright © 2015 Riley Testut. All rights reserved.
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//
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import CoreData
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extension NSManagedObject
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{
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class var entityName: String
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{
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return NSStringFromClass(self)
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}
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class func insertIntoManagedObjectContext(_ managedObjectContext: NSManagedObjectContext) -> Self
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{
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return self.insertIntoManagedObjectContext(managedObjectContext, type: self)
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}
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private class func insertIntoManagedObjectContext<T>(_ managedObjectContext: NSManagedObjectContext, type: T.Type) -> T
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{
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let object = NSEntityDescription.insertNewObject(forEntityName: self.entityName, into: managedObjectContext) as! T
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return object
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}
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// MARK: - Fetches -
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class func rst_fetchRequest() -> NSFetchRequest<NSFetchRequestResult>
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{
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let fetchRequest = NSFetchRequest<NSFetchRequestResult>(entityName: self.entityName)
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return fetchRequest
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}
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class func instancesInManagedObjectContext<T: NSManagedObject>(_ managedObjectContext: NSManagedObjectContext, type: T.Type) -> [T]
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{
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return self.instancesWithPredicate(nil, inManagedObjectContext: managedObjectContext, type: type)
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}
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class func instancesWithPredicate<T: NSManagedObject>(_ predicate: Predicate?, inManagedObjectContext managedObjectContext: NSManagedObjectContext, type: T.Type) -> [T]
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{
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let fetchRequest = self.rst_fetchRequest()
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fetchRequest.predicate = predicate
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var results: [T] = []
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do
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{
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results = try managedObjectContext.fetch(fetchRequest) as! [T]
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}
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catch let error as NSError
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{
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print("Error loading", predicate, error)
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}
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return results
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}
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}
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