 
 		mainContext.processPendingChanges()
 
-		let controller = Children.query(self.mainContext)
+		let controller = mainContext.reactive
+			.objects(Children.self)
 			.sort(by: .ascending("value"))
 			.makeController()
 

	}

	func measureFRCDeletionPerformance(times: Int) {
		let controller = Children.query(mainContext)
			.sort(by: .ascending("value"))
			.makeController()


	}

	func measureOCInsertionPerformance(times: Int) {
		let collection = mainContext.reactive
			.objects(Children.self)
			.sort(by: .ascending("value"))
			.makeCollection(prefetching: .none)

