CollectionListModel.swift
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CollectionListModel.swift
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	import SwiftUI
	import CoreData

	class CollectionListModel: NSObject, ObservableObject {

	private let logger = Logging(for: String(describing: CollectionListModel.self))

	@Published var list: [WFACollection] = []
	private let collectionsController: NSFetchedResultsController<WFACollection>

	init(managedObjectContext: NSManagedObjectContext) {
	collectionsController = NSFetchedResultsController(fetchRequest: WFACollection.collectionsFetchRequest,
	managedObjectContext: managedObjectContext,
	sectionNameKeyPath: nil,
	cacheName: nil)

	super.init()

	collectionsController.delegate = self

	do {
	logger.log("Fetching collections from local store...")
	try collectionsController.performFetch()
	list = collectionsController.fetchedObjects ?? []
	logger.log("Fetched collections from local store.")
	} catch {
	logger.logCrashAndSetFlag(error: LocalStoreError.couldNotFetchCollections)
	}
	}
	}

	extension CollectionListModel: NSFetchedResultsControllerDelegate {
	func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
	guard let collections = controller.fetchedObjects as? [WFACollection] else { return }
	self.list = collections
	}
	}

	extension WFACollection {
	static var collectionsFetchRequest: NSFetchRequest<WFACollection> {
	let request: NSFetchRequest<WFACollection> = WFACollection.createFetchRequest()
	request.sortDescriptors = [NSSortDescriptor(keyPath: \WFACollection.title, ascending: true)]
	return request
	}
	}