Extend NSManagedObjectContext to update context after batch delete

Shared/Extensions/NSManagedObjectContext+ExecuteAndMergeChanges.swift

@@ -0,0 +1,17 @@
+import CoreData
+
+extension NSManagedObjectContext {
+    /// Executes the given `NSBatchDeleteRequest` and directly merges the changes to bring the given
+    /// managed object context up to date.
+    ///
+    /// Credit: https://www.avanderlee.com/swift/nsbatchdeleterequest-core-data/
+    ///
+    /// - Parameter batchDeleteRequest: The `NSBatchDeleteRequest` to execute.
+    /// - Throws: An error if anything went wrong executing the batch deletion.
+    public func executeAndMergeChanges(using batchDeleteRequest: NSBatchDeleteRequest) throws {
+        batchDeleteRequest.resultType = .resultTypeObjectIDs
+        let result = try execute(batchDeleteRequest) as? NSBatchDeleteResult
+        let changes: [AnyHashable: Any] = [NSDeletedObjectsKey: result?.result as? [NSManagedObjectID] ?? []]
+        NSManagedObjectContext.mergeChanges(fromRemoteContextSave: changes, into: [self])
+    }
+}

Shared/LocalStorageManager.swift

@@ -50,9 +50,7 @@ class LocalStorageManager {
         let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
 
         do {
-            try LocalStorageManager.persistentContainer.persistentStoreCoordinator.execute(
-                deleteRequest, with: LocalStorageManager.persistentContainer.viewContext
-            )
+            try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest)
         } catch {
             print("Error: Failed to purge cached collections.")
         }

Shared/Models/WriteFreelyModel.swift

@@ -174,8 +174,8 @@ private extension WriteFreelyModel {
                 try purgeTokenFromKeychain(username: account.user?.username, server: account.server)
                 client = nil
                 DispatchQueue.main.async {
-                    LocalStorageManager().purgeUserCollections()
                     self.account.logout()
+                    LocalStorageManager().purgeUserCollections()
                     self.posts.purgeAllPosts()
                 }
             } catch {

Shared/PostList/PostListModel.swift

@@ -28,9 +28,7 @@ class PostListModel: ObservableObject {
         let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
 
         do {
-            try LocalStorageManager.persistentContainer.persistentStoreCoordinator.execute(
-                deleteRequest, with: LocalStorageManager.persistentContainer.viewContext
-            )
+            try LocalStorageManager.persistentContainer.viewContext.executeAndMergeChanges(using: deleteRequest)
         } catch {
             print("Error: Failed to purge cached posts.")
         }

WriteFreely-MultiPlatform.xcodeproj/project.pbxproj

@@ -54,6 +54,7 @@
 		17C42E632507D8E600072984 /* PostStatus.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17C42E612507D8E600072984 /* PostStatus.swift */; };
 		17C42E652509237800072984 /* PostListFilteredView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17C42E642509237800072984 /* PostListFilteredView.swift */; };
 		17C42E662509237800072984 /* PostListFilteredView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17C42E642509237800072984 /* PostListFilteredView.swift */; };
+		17C42E70250AA12300072984 /* NSManagedObjectContext+ExecuteAndMergeChanges.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17C42E6F250AA12200072984 /* NSManagedObjectContext+ExecuteAndMergeChanges.swift */; };
 		17D435E824E3128F0036B539 /* PreferencesModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17D435E724E3128F0036B539 /* PreferencesModel.swift */; };
 		17D435E924E3128F0036B539 /* PreferencesModel.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17D435E724E3128F0036B539 /* PreferencesModel.swift */; };
 		17DF329D24C87D3500BCE2E3 /* Tests_iOS.swift in Sources */ = {isa = PBXBuildFile; fileRef = 17DF329C24C87D3500BCE2E3 /* Tests_iOS.swift */; };
@@ -114,6 +115,7 @@
 		17B996D72502D23E0017B536 /* WFAPost+CoreDataProperties.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "WFAPost+CoreDataProperties.swift"; sourceTree = SOURCE_ROOT; };
 		17C42E612507D8E600072984 /* PostStatus.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PostStatus.swift; sourceTree = "<group>"; };
 		17C42E642509237800072984 /* PostListFilteredView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PostListFilteredView.swift; sourceTree = "<group>"; };
+		17C42E6F250AA12200072984 /* NSManagedObjectContext+ExecuteAndMergeChanges.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "NSManagedObjectContext+ExecuteAndMergeChanges.swift"; sourceTree = "<group>"; };
 		17D435E724E3128F0036B539 /* PreferencesModel.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PreferencesModel.swift; sourceTree = "<group>"; };
 		17DF328124C87D3300BCE2E3 /* WriteFreely_MultiPlatformApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = WriteFreely_MultiPlatformApp.swift; sourceTree = "<group>"; };
 		17DF328224C87D3300BCE2E3 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -193,6 +195,7 @@
 			isa = PBXGroup;
 			children = (
 				1756AE8024CB844500FD7257 /* View+Keyboard.swift */,
+				17C42E6F250AA12200072984 /* NSManagedObjectContext+ExecuteAndMergeChanges.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -591,6 +594,7 @@
 				17120DA324E19A42002B9F6C /* PreferencesView.swift in Sources */,
 				1756AE6E24CB255B00FD7257 /* PostListModel.swift in Sources */,
 				174D313224EC2831006CA9EE /* WriteFreelyModel.swift in Sources */,
+				17C42E70250AA12300072984 /* NSManagedObjectContext+ExecuteAndMergeChanges.swift in Sources */,
 				17120DA124E19839002B9F6C /* AccountView.swift in Sources */,
 				1756AE7424CB26FA00FD7257 /* PostCellView.swift in Sources */,
 			);