 	var mainContext: NSManagedObjectContext!
 
 	func measureOCDeletionPerformance(times: Int) {
-		let collection = Children.query(mainContext)
+		let collection = mainContext.reactive
+			.objects(Children.self)
 			.sort(by: .ascending("value"))
 			.makeCollection(prefetching: .none)
 

			expect(error).to(beNil())
		}

		mainContext = NSManagedObjectContext(parent: .persistentStore(storeCoordinator),
		                                     concurrencyType: .mainQueueConcurrencyType)
	}

	override func tearDown() {

	}

	func measureFRCInsertionPerformance(times: Int) {
		let controller = mainContext.reactive
			.objects(Children.self)
			.sort(by: .ascending("value"))
			.makeController()

