Readme update and refactor of examples

Author: anconaesselmann

Examples/Example_01/Example_01/Managers/NotesManager.swift

@@ -22,32 +22,26 @@ class NotesManager {
         self.container = container
     }
 
-    func fetch() async throws -> [NoteEntity] {
-        try await viewContext.perform {
-            let request = NoteEntity.fetchRequest()
-            return try self.viewContext.fetch(request)
-        }
+    func fetch() throws -> [NoteEntity] {
+        let request = NoteEntity.fetchRequest()
+        return try self.viewContext.fetch(request)
     }
 
-    func create(text: String) async throws {
-        try await viewContext.perform {
-            let entity = NoteEntity(
-                context: self.viewContext,
-                id: UUID(),
-                text: text,
-                created: .now
-            )
-            try self.viewContext.save()
-            self._noteCreated.send(entity)
-        }
+    func create(text: String) throws {
+        let entity = NoteEntity(
+            context: self.viewContext,
+            id: UUID(),
+            text: text,
+            created: .now
+        )
+        try self.viewContext.save()
+        self._noteCreated.send(entity)
     }
 
-    func delete(notes: [NoteEntity]) async throws {
-        try await viewContext.perform {
-            notes.forEach {
-                self.viewContext.delete($0)
-            }
-            try self.viewContext.save()
+    func delete(notes: [NoteEntity]) throws {
+        notes.forEach {
+            self.viewContext.delete($0)
         }
+        try self.viewContext.save()
     }
 }

Examples/Example_01/Example_01/UI/CreateNoteView.swift

@@ -15,9 +15,11 @@ struct CreateNoteView: View {
             TextField("new note", text: $text)
                 .textFieldStyle(.roundedBorder)
             Button("create") {
-                Task {
-                    try await notesManager.create(text: text)
+                do {
+                    try notesManager.create(text: text)
                     text = ""
+                } catch {
+                    assertionFailure(error.localizedDescription)
                 }
             }
             .disabled(text.isEmpty)

Examples/Example_01/Example_01/UI/NotesView.swift

@@ -24,15 +24,17 @@ class NotesViewModel: ObservableObject {
             .store(in: &bag)
     }
 
-    func fetch() async {
-        notes = (try? await notesManager.fetch()) ?? []
+    func fetch() {
+        notes = (try? notesManager.fetch()) ?? []
     }
 
     func delete(indexSet: IndexSet) {
         let toDelete = indexSet.map { notes[$0] }
-        Task {
-            try await notesManager.delete(notes: toDelete)
+        do {
+            try notesManager.delete(notes: toDelete)
             notes.remove(atOffsets: indexSet)
+        } catch {
+            assertionFailure(error.localizedDescription)
         }
     }
 }
@@ -55,7 +57,7 @@ struct NotesView: View {
             }
         }
         .task {
-            await vm.fetch()
+            vm.fetch()
         }
     }
 }

Examples/Example_02/Example_02/Managers/AuthorsManager.swift

@@ -22,31 +22,25 @@ class AuthorsManager {
         self.container = container
     }
 
-    func fetch() async throws -> [AuthorEntity] {
-        try await viewContext.perform {
-            let request = AuthorEntity.fetchRequest()
-            return try self.viewContext.fetch(request)
-        }
+    func fetch() throws -> [AuthorEntity] {
+        let request = AuthorEntity.fetchRequest()
+        return try self.viewContext.fetch(request)
     }
 
-    func create(name: String) async throws {
-        try await viewContext.perform {
-            let entity = AuthorEntity(
-                context: self.viewContext,
-                id: UUID(),
-                name: name
-            )
-            try self.viewContext.save()
-            self._authorCreated.send(entity)
-        }
+    func create(name: String) throws {
+        let entity = AuthorEntity(
+            context: self.viewContext,
+            id: UUID(),
+            name: name
+        )
+        try self.viewContext.save()
+        self._authorCreated.send(entity)
     }
 
-    func delete(authors: [AuthorEntity]) async throws {
-        try await viewContext.perform {
-            authors.forEach {
-                self.viewContext.delete($0)
-            }
-            try self.viewContext.save()
+    func delete(authors: [AuthorEntity]) throws {
+        authors.forEach {
+            self.viewContext.delete($0)
         }
+        try self.viewContext.save()
     }
 }

Examples/Example_02/Example_02/Managers/BooksManager.swift

@@ -23,31 +23,25 @@ class BooksManager {
     }
 
     func fetch() async throws -> [BookEntity] {
-        try await viewContext.perform {
-            let request = BookEntity.fetchRequest()
-            return try self.viewContext.fetch(request)
-        }
+        let request = BookEntity.fetchRequest()
+        return try self.viewContext.fetch(request)
     }
 
     func create(title: String, author: AuthorEntity) async throws {
-        try await viewContext.perform {
-            let entity = BookEntity(
-                context: self.viewContext,
-                id: UUID(),
-                title: title,
-                author: author
-            )
-            try self.viewContext.save()
-            self._bookCreated.send(entity)
-        }
+        let entity = BookEntity(
+            context: self.viewContext,
+            id: UUID(),
+            title: title,
+            author: author
+        )
+        try self.viewContext.save()
+        self._bookCreated.send(entity)
     }
 
     func delete(books: [BookEntity]) async throws {
-        try await viewContext.perform {
-            books.forEach {
-                self.viewContext.delete($0)
-            }
-            try self.viewContext.save()
+        books.forEach {
+            self.viewContext.delete($0)
         }
+        try self.viewContext.save()
     }
 }

README.md

@@ -69,6 +69,8 @@ let container = try await NSManagedObjectModel(Note.self)
     .createContainer(name: "Notes", location: .local)
 ```
 
+See [NotesManager](https://github.com/anconaesselmann/ProgrammaticCoreData/blob/main/Examples/Example_01/Example_01/Managers/NotesManager.swift) for basic CRUD operations
+
 - [Example_02](https://github.com/anconaesselmann/ProgrammaticCoreData/tree/main/Examples/Example_02) is a Book Archive app with a to-many relationship from an `Author` to their `Book`s and an inverse to-one relationship from a `Book` and it's `Author`:
 
 We create an `Author` entity programmatically: