From 97971e53dbd7b4d4a3a095923acfaae69d824c99 Mon Sep 17 00:00:00 2001
From: Michael Huster <mhuster@itemis.com>
Date: Wed, 3 Jan 2024 16:57:23 +0100
Subject: [PATCH] fix(modelql): fix serialization of nullMono

---
 .../kotlin/org/modelix/modelql/typed/TypedModelQL.kt           | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modelql-typed/src/commonMain/kotlin/org/modelix/modelql/typed/TypedModelQL.kt b/modelql-typed/src/commonMain/kotlin/org/modelix/modelql/typed/TypedModelQL.kt
index 2069c02cf1..84deb8876a 100644
--- a/modelql-typed/src/commonMain/kotlin/org/modelix/modelql/typed/TypedModelQL.kt
+++ b/modelql-typed/src/commonMain/kotlin/org/modelix/modelql/typed/TypedModelQL.kt
@@ -168,8 +168,9 @@ object TypedModelQL {
         return input.map { referenceOrNull(it, link) }
     }
 
+    @Suppress("UNCHECKED_CAST")
     fun <SourceT : ITypedNode, TargetT : ITypedNode> setReference(input: IMonoStep<SourceT>, link: ITypedReferenceLink<TargetT>, target: IMonoStep<TargetT?>?): IMonoStep<SourceT> {
-        val targetOrNull = target?.untyped() ?: nullMono<INode>()
+        val targetOrNull = target?.untyped() ?: nullMono<String>() as IMonoStep<INode?> // cast is necessary since nullMono<INode> cannot be serialized
         input.untyped().setReference(link.untyped(), targetOrNull)
         return input
     }