From 5abda67b00d682da0a5b1352d2c35a8af3717601 Mon Sep 17 00:00:00 2001
From: "Pfeil, Scott Robert" <scott.pfeil3@verizonwireless.com>
Date: Mon, 11 May 2020 16:14:43 -0400
Subject: [PATCH] delegate object for model decoding functions

---
 .../MVMCore/Models/Extensions/Decoder.swift   | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/MVMCore/MVMCore/Models/Extensions/Decoder.swift b/MVMCore/MVMCore/Models/Extensions/Decoder.swift
index 5435b1d..04c0be7 100644
--- a/MVMCore/MVMCore/Models/Extensions/Decoder.swift
+++ b/MVMCore/MVMCore/Models/Extensions/Decoder.swift
@@ -61,4 +61,26 @@ extension Decodable {
     }
 }
 
+public enum DecoderKeyError: Error {
+    case createKey
+}
 
+public extension JSONDecoder {
+    /// Adds a delegate object to the decoder for use in the model initializers.
+    func add<T: DelegateObject>(delegateObject: T) throws {
+        guard let key = CodingUserInfoKey(rawValue: "delegateObject") else {
+            throw DecoderKeyError.createKey
+        }
+        userInfo.updateValue(delegateObject, forKey: key)
+    }
+}
+
+public extension Decoder {
+    /// Gets a delegate object from the decoder for use in the model initializers. Had to be added before decode.
+    func get<T: DelegateObject>() throws -> T? {
+        guard let key = CodingUserInfoKey(rawValue: "delegateObject") else {
+            throw DecoderKeyError.createKey
+        }
+        return userInfo[key] as? T
+    }
+}