🐛 Fixing bug where User data was not properly saved to CoreData

DHBW-Service/CoreData/Persistence.swift

@@ -51,7 +51,7 @@ struct PersistenceController {
         if self.context.hasChanges {
             do {
                 try self.context.save()
-                print("In CoreData.stack.save()")
+                print("In PersistenceController.shared.save()")
             } catch {
                 let nserror = error as NSError
                 fatalError("Unresolved error \(nserror), \(nserror.userInfo)")

DHBW-Service/Utility/UtilityFunctions.swift

@@ -0,0 +1,42 @@
+//
+//  UtilityFunctions.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 22.12.20.
+//
+
+import Foundation
+import CoreData
+
+class UtilityFunctions {
+    public class func getCoreDataObject(entity: String) -> [NSManagedObject]{
+        let managedContext =
+            PersistenceController.shared.context
+        
+        let fetchRequest =
+          NSFetchRequest<NSManagedObject>(entityName: entity)
+        
+        do {
+            return try managedContext.fetch(fetchRequest)
+        } catch let error as NSError {
+            print("Could not fetch. \(error), \(error.userInfo)")
+            return []
+        }
+    }
+    
+    public class func deleteAllCoreDataEntitiesOfType(type: String) -> Bool{
+        let fetchRequest: NSFetchRequest<NSFetchRequestResult> = NSFetchRequest(entityName: type)
+        let deleteRequest = NSBatchDeleteRequest(fetchRequest: fetchRequest)
+
+        do {
+            try PersistenceController.shared.context.execute(deleteRequest)
+            
+            PersistenceController.shared.save()
+            
+            return true
+        } catch let error as NSError {
+            print(error)
+            return false
+        }
+    }
+}

DHBW-Service/Views/Other/FirstOpeningSettings.swift

@@ -34,6 +34,7 @@ struct FirstOpeningSettings: View {
                 .padding(.horizontal)
             Button(action: {
                 self.settings.isFirstOpening = !self.settings.isFirstOpening
+                self.saveToCoreData()
             }){
                 Text("Confirm")
                     .padding()
@@ -47,6 +48,11 @@ struct FirstOpeningSettings: View {
 
 extension FirstOpeningSettings{
     func saveToCoreData(){
+        // Delete old user data
+        let status = UtilityFunctions.deleteAllCoreDataEntitiesOfType(type: "User")
+        print("Deleting old user data status: \(status)")
+        
+        // Insert new user data
         let entity = NSEntityDescription.entity(forEntityName: "User", in: PersistenceController.shared.context)!
         let user = NSManagedObject(entity: entity, insertInto: PersistenceController.shared.context)
         user.setValue(name, forKey: "name")

DHBW-Service/Views/Tabs/HomeView.swift

@@ -10,10 +10,7 @@ import CoreData
 
 struct HomeView: View {
     @EnvironmentObject var settings: LocalSettings
-    @State var user: NSManagedObject = NSManagedObject()
-    
-    
-    
+    @State private var name: String = ""
     
     var body: some View {
         VStack {
@@ -24,7 +21,7 @@ struct HomeView: View {
             }
             Text("Test")
             
-//            Text(user.value(forKey: "name") as! String)
+            Text(self.name)
             
         }.onAppear{
             self.readFromCoreData()
@@ -33,15 +30,12 @@ struct HomeView: View {
 }
 
 extension HomeView{
-    func readFromCoreData(){
-        let managedContext = PersistenceController.shared.context
-        let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "User")
+    func readFromCoreData() {
+        let fetchedData = UtilityFunctions.getCoreDataObject(entity: "User")
         
-        do {
-            try print(managedContext.fetch(fetchRequest))
-            self.user = try managedContext.fetch(fetchRequest)[0]
-        } catch let error as NSError {
-            print(error)
+        if(!fetchedData.isEmpty) {
+            let user = fetchedData[0]
+            self.name = user.value(forKey: "name") as! String
         }
     }
 }