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AngeloStavrowAngeloStavrow
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Merge pull request #42 from writeas/persist-content-locally
Persist content locally
2 parents 3751118 + 888de9e commit 353c9e6

28 files changed

+632
-472
lines changed

‎Shared/Extensions/NSManagedObjectContext+ExecuteAndMergeChanges.swift‎

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import CoreData
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extension NSManagedObjectContext {
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/// Executes the given `NSBatchDeleteRequest` and directly merges the changes to bring the given
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/// managed object context up to date.
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///
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/// Credit: https://www.avanderlee.com/swift/nsbatchdeleterequest-core-data/
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///
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/// - Parameter batchDeleteRequest: The `NSBatchDeleteRequest` to execute.
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/// - Throws: An error if anything went wrong executing the batch deletion.
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public func executeAndMergeChanges(using batchDeleteRequest: NSBatchDeleteRequest) throws {
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batchDeleteRequest.resultType = .resultTypeObjectIDs
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let result = try execute(batchDeleteRequest) as? NSBatchDeleteResult
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let changes: [AnyHashable: Any] = [NSDeletedObjectsKey: result?.result as? [NSManagedObjectID] ?? []]
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NSManagedObjectContext.mergeChanges(fromRemoteContextSave: changes, into: [self])
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}
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}

‎Shared/LocalStorageManager.swift‎

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import CoreData
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#if os(iOS)
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import UIKit
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#elseif os(macOS)
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import AppKit
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#endif
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class LocalStorageManager {
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static let persistentContainer: NSPersistentContainer = {
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let container = NSPersistentContainer(name: "LocalStorageModel")
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container.loadPersistentStores { _, error in
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container.viewContext.mergePolicy = NSMergeByPropertyObjectTrumpMergePolicy
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if let error = error {
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fatalError("Unresolved error loading persistent store: \(error)")
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}
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}
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return container
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}()
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init() {
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let center = NotificationCenter.default
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#if os(iOS)
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let notification = UIApplication.willResignActiveNotification
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#elseif os(macOS)
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let notification = NSApplication.willResignActiveNotification
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#endif
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// We don't need to worry about removing this observer because we're targeting iOS 9+ / macOS 10.11+; the
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// system will clean this up the next time it would be posted to.
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// See: https://developer.apple.com/documentation/foundation/notificationcenter/1413994-removeobserver
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// And: https://developer.apple.com/documentation/foundation/notificationcenter/1407263-removeobserver
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// swiftlint:disable:next discarded_notification_center_observer
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center.addObserver(forName: notification, object: nil, queue: nil, using: self.saveContextOnResignActive)
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}
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func saveContext() {
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if LocalStorageManager.persistentContainer.viewContext.hasChanges {
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do {
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try LocalStorageManager.persistentContainer.viewContext.save()
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} catch {
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print("Error saving context: \(error)")
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}
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}
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}
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func purgeUserCollections() {
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let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: "WFACollection")
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let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
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do {
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try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest)
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} catch {
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print("Error: Failed to purge cached collections.")
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}
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}
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}
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private extension LocalStorageManager {
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func saveContextOnResignActive(_ notification: Notification) {
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saveContext()
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}
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}

‎Shared/Models/LocalStorageModel.xcdatamodeld/LocalStorageModel.xcdatamodel/contents‎

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<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
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<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="17189" systemVersion="20A5364e" minimumToolsVersion="Automatic" sourceLanguage="Swift" userDefinedModelVersionIdentifier="">
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<entity name="WFACollection" representedClassName="WFACollection" syncable="YES">
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<attribute name="alias" optional="YES" attributeType="String"/>
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<attribute name="blogDescription" optional="YES" attributeType="String"/>
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<attribute name="email" optional="YES" attributeType="String"/>
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<attribute name="isPublic" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
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<attribute name="styleSheet" optional="YES" attributeType="String"/>
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<attribute name="title" attributeType="String"/>
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<attribute name="url" optional="YES" attributeType="String"/>
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<uniquenessConstraints>
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<uniquenessConstraint>
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<constraint value="alias"/>
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</uniquenessConstraint>
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</uniquenessConstraints>
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</entity>
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<entity name="WFAPost" representedClassName="WFAPost" syncable="YES">
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<attribute name="appearance" optional="YES" attributeType="String"/>
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<attribute name="body" attributeType="String"/>
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<attribute name="collectionAlias" optional="YES" attributeType="String"/>
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<attribute name="createdDate" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
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<attribute name="hasNewerRemoteCopy" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
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<attribute name="language" optional="YES" attributeType="String"/>
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<attribute name="postId" optional="YES" attributeType="String"/>
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<attribute name="rtl" optional="YES" attributeType="Boolean" usesScalarValueType="YES"/>
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<attribute name="slug" optional="YES" attributeType="String"/>
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<attribute name="status" attributeType="Integer 32" defaultValueString="0" usesScalarValueType="YES"/>
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<attribute name="title" optional="YES" attributeType="String"/>
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<attribute name="updatedDate" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
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<uniquenessConstraints>
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<uniquenessConstraint>
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<constraint value="postId"/>
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</uniquenessConstraint>
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</uniquenessConstraints>
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</entity>
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<elements>
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<element name="WFACollection" positionX="14.806640625" positionY="202.9156341552734" width="128" height="148"/>
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<element name="WFAPost" positionX="287.377197265625" positionY="243.2452697753906" width="128" height="209"/>
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</elements>
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</model>

‎Shared/Models/Post.swift‎

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‎Shared/Models/PostCollection.swift‎

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‎Shared/Models/PostStatus.swift‎

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import Foundation
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enum PostStatus: Int32 {
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case local = 0
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case edited = 1
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case published = 2
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}

‎Shared/Models/PostStore.swift‎

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