From 54572030a422188a1d36acc9190f756737990ee4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Helge=20He=C3=9F?= <devteam@zeezide.de>
Date: Fri, 16 Feb 2024 14:49:02 +0100
Subject: [PATCH] Show a warning if a transformer is not registered

For named transformers.
---
 .../SchemaCompatibility/NSAttributeDescription+Data.swift     | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Sources/ManagedModels/SchemaCompatibility/NSAttributeDescription+Data.swift b/Sources/ManagedModels/SchemaCompatibility/NSAttributeDescription+Data.swift
index 162efbd..6e7f240 100644
--- a/Sources/ManagedModels/SchemaCompatibility/NSAttributeDescription+Data.swift
+++ b/Sources/ManagedModels/SchemaCompatibility/NSAttributeDescription+Data.swift
@@ -209,6 +209,10 @@ private extension NSAttributeDescription {
           assert(valueTransformerName == nil)
           attributeType = .transformableAttributeType
           valueTransformerName = name
+          if !ValueTransformer.valueTransformerNames().contains(.init(name)) {
+            print("WARNING: Named transformer is not registered: \(name)",
+                  "in attribute:", self)
+          }
         case .transformableByType(let type):
           let name = NSStringFromClass(type)
           if !ValueTransformer.valueTransformerNames().contains(.init(name)) {