Changed file structure

DHBW-Service/CoreData/DHBW_Service.xcdatamodeld/.xccurrentversion

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>_XCCurrentVersionName</key>
+	<string>DHBW_Service.xcdatamodel</string>
+</dict>
+</plist>

DHBW-Service/CoreData/DHBW_Service.xcdatamodeld/DHBW_Service.xcdatamodel/contents

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<model type="com.apple.IDECoreDataModeler.DataModel" documentVersion="1.0" lastSavedToolsVersion="1" systemVersion="11A491" minimumToolsVersion="Automatic" sourceLanguage="Swift" usedWithCloudKit="true" userDefinedModelVersionIdentifier="">
+    <entity name="Item" representedClassName="Item" syncable="YES" codeGenerationType="class">
+        <attribute name="timestamp" optional="YES" attributeType="Date" usesScalarValueType="NO"/>
+    </entity>
+    <elements>
+        <element name="Item" positionX="-63" positionY="-18" width="128" height="44"/>
+    </elements>
+</model>

DHBW-Service/CoreData/Persistence.swift

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+//
+//  Persistence.swift
+//  DHBW-Service
+//
+//  Created by Patrick Müller on 20.12.20.
+//
+
+import CoreData
+
+struct PersistenceController {
+    // Singleton
+    static let shared = PersistenceController()
+
+    // Cloud Kit container
+    let container: NSPersistentCloudKitContainer
+    
+    // Managed object context
+    public var context: NSManagedObjectContext {
+        get {
+            return self.container.viewContext
+        }
+    }
+
+    // MARK: - Constructor
+    init(inMemory: Bool = false) {
+        container = NSPersistentCloudKitContainer(name: "DHBW_Service")
+        if inMemory {
+            container.persistentStoreDescriptions.first!.url = URL(fileURLWithPath: "/dev/null")
+        }
+        container.loadPersistentStores(completionHandler: { (storeDescription, error) in
+            if let error = error as NSError? {
+                // Replace this implementation with code to handle the error appropriately.
+                // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
+
+                /*
+                Typical reasons for an error here include:
+                * The parent directory does not exist, cannot be created, or disallows writing.
+                * The persistent store is not accessible, due to permissions or data protection when the device is locked.
+                * The device is out of space.
+                * The store could not be migrated to the current model version.
+                Check the error message to determine what the actual problem was.
+                */
+                fatalError("Unresolved error \(error), \(error.userInfo)")
+            }
+        })
+    }
+    
+    // MARK: - Core Data Saving support
+    
+    public func save() {
+        if self.context.hasChanges {
+            do {
+                try self.context.save()
+                print("In CoreData.stack.save()")
+            } catch {
+                let nserror = error as NSError
+                fatalError("Unresolved error \(nserror), \(nserror.userInfo)")
+            }
+        }
+    }
+    
+    // MARK: - Preview content
+    static var preview: PersistenceController = {
+        let result = PersistenceController(inMemory: true)
+        let viewContext = result.container.viewContext
+        for _ in 0..<10 {
+            let newItem = Item(context: viewContext)
+            newItem.timestamp = Date()
+        }
+        do {
+            try viewContext.save()
+        } catch {
+            // Replace this implementation with code to handle the error appropriately.
+            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
+            let nsError = error as NSError
+            fatalError("Unresolved error \(nsError), \(nsError.userInfo)")
+        }
+        return result
+    }()
+}