LocalDatabase.swift

class LocalDatabase {

	private let pathUrl: URL
	let persistentStoreCoordinator: NSPersistentStoreCoordinator

	private init(fileName: String) {
		pathUrl = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last!
			.appendingPathComponent(fileName + ".sqlite")
		guard let model = NSManagedObjectModel.mergedModel(from: [Bundle.main])
			else { fatalError() }
		persistentStoreCoordinator = NSPersistentStoreCoordinator(managedObjectModel: model)
		do {
			try persistentStoreCoordinator.addPersistentStore(
				ofType: NSSQLiteStoreType,
				configurationName: nil,
				at: pathUrl,
				options: nil)
		} catch {
			try? FileManager.default.removeItem(at: pathUrl)
			fatalError()
		}
		context = NSManagedObjectContext(concurrencyType: .mainQueueConcurrencyType)
		context.persistentStoreCoordinator = persistentStoreCoordinator

	}

	let context: NSManagedObjectContext

	func reset() {
		try? FileManager.default.removeItem(at: pathUrl)
		fatalError()
	}

}