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Code Issues Releases Wiki Activity

Extend NSManagedObjectContext to update context after batch delete

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This commit is contained in:
Angelo Stavrow 2020-09-10 14:08:29 -04:00
parent 089a12dcb2
commit bc7ac18a7e
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GPG Key ID: 1A49C7064E060EEE
5 changed files with 24 additions and 7 deletions
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17
Shared/Extensions/NSManagedObjectContext+ExecuteAndMergeChanges.swift Normal file
View File

@ -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])
}
}

4
Shared/LocalStorageManager.swift
View File

@ -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.")
}

2
Shared/Models/WriteFreelyModel.swift
View File

@ -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 {

4
Shared/PostList/PostListModel.swift
View File

@ -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.")
}

4
WriteFreely-MultiPlatform.xcodeproj/project.pbxproj
View File

@ -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 */,
);