From 81b82adab2998d887e342052d8fe5f46fad1ef27 Mon Sep 17 00:00:00 2001
From: Bart Koelman <10324372+bkoelman@users.noreply.github.com>
Date: Wed, 19 Jun 2024 05:43:42 +0200
Subject: [PATCH] Fixed: return empty object instead of data:null in operation
 results

---
 .../WriteOnlyDocumentConverter.cs             | 23 ++++++++++++++++++-
 .../Mixed/AtomicSerializationTests.cs         |  4 +---
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/JsonApiDotNetCore/Serialization/JsonConverters/WriteOnlyDocumentConverter.cs b/src/JsonApiDotNetCore/Serialization/JsonConverters/WriteOnlyDocumentConverter.cs
index 2597afacac..a8f3e7f81e 100644
--- a/src/JsonApiDotNetCore/Serialization/JsonConverters/WriteOnlyDocumentConverter.cs
+++ b/src/JsonApiDotNetCore/Serialization/JsonConverters/WriteOnlyDocumentConverter.cs
@@ -61,7 +61,28 @@ public override void Write(Utf8JsonWriter writer, Document value, JsonSerializer
         if (!value.Results.IsNullOrEmpty())
         {
             writer.WritePropertyName(AtomicResultsText);
-            WriteSubTree(writer, value.Results, options);
+            writer.WriteStartArray();
+
+            foreach (AtomicResultObject result in value.Results)
+            {
+                writer.WriteStartObject();
+
+                if (result.Data.IsAssigned)
+                {
+                    writer.WritePropertyName(DataText);
+                    WriteSubTree(writer, result.Data, options);
+                }
+
+                if (!result.Meta.IsNullOrEmpty())
+                {
+                    writer.WritePropertyName(MetaText);
+                    WriteSubTree(writer, result.Meta, options);
+                }
+
+                writer.WriteEndObject();
+            }
+
+            writer.WriteEndArray();
         }
 
         if (!value.Errors.IsNullOrEmpty())
diff --git a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Mixed/AtomicSerializationTests.cs b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Mixed/AtomicSerializationTests.cs
index 4f6a2f0a3c..fc6d366f94 100644
--- a/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Mixed/AtomicSerializationTests.cs
+++ b/test/JsonApiDotNetCoreTests/IntegrationTests/AtomicOperations/Mixed/AtomicSerializationTests.cs
@@ -101,9 +101,7 @@ await _testContext.RunOnDatabaseAsync(async dbContext =>
                 "self": "http://localhost/operations"
               },
               "atomic:results": [
-                {
-                  "data": null
-                },
+                {},
                 {
                   "data": {
                     "type": "textLanguages",