From a26b62aa4c55564f98b9bce61e788d9d574a0a23 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrick=20Mu=CC=88ller?= <patrick@plutodev.de>
Date: Mon, 21 Dec 2020 18:44:34 +0100
Subject: [PATCH] Annotating and reordering Core Data Persistence Class

---
 DHBW-Service/Persistence.swift | 47 +++++++++++++++++++++-------------
 1 file changed, 29 insertions(+), 18 deletions(-)

diff --git a/DHBW-Service/Persistence.swift b/DHBW-Service/Persistence.swift
index b8facdb..0e37f55 100644
--- a/DHBW-Service/Persistence.swift
+++ b/DHBW-Service/Persistence.swift
@@ -8,28 +8,20 @@
 import CoreData
 
 struct PersistenceController {
+    // Singleton
     static let shared = PersistenceController()
 
-    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
-    }()
-
+    // Cloud Kit container
     let container: NSPersistentCloudKitContainer
+    
+    // Managed object context
+    public var context: NSManagedObjectContext {
+        get {
+            return self.container.viewContext
+        }
+    }
 
+    // Constructor
     init(inMemory: Bool = false) {
         container = NSPersistentCloudKitContainer(name: "DHBW_Service")
         if inMemory {
@@ -52,4 +44,23 @@ struct PersistenceController {
             }
         })
     }
+    
+    // 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
+    }()
 }