Switches to Core Data model objects

AltStore/Extensions/JSONDecoder+ManagedObjectContext.swift

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+//
+//  JSONDecoder+ManagedObjectContext.swift
+//  Harmony
+//
+//  Created by Riley Testut on 10/3/18.
+//  Copyright © 2018 Riley Testut. All rights reserved.
+//
+
+import Foundation
+import CoreData
+
+private extension CodingUserInfoKey
+{
+    static let managedObjectContext = CodingUserInfoKey(rawValue: "managedObjectContext")!
+}
+
+public extension JSONDecoder
+{
+    var managedObjectContext: NSManagedObjectContext? {
+        get {
+            let managedObjectContext = self.userInfo[.managedObjectContext] as? NSManagedObjectContext
+            return managedObjectContext
+        }
+        set {
+            self.userInfo[.managedObjectContext] = newValue
+        }
+    }
+}
+
+public extension Decoder
+{
+    var managedObjectContext: NSManagedObjectContext? {
+        let managedObjectContext = self.userInfo[.managedObjectContext] as? NSManagedObjectContext
+        return managedObjectContext
+    }
+}