OpenAPITools / OpenAPITools/openapi-generator

[csharp][generichost] AnyOf serialization issue

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Description

P2: ColorOrNullJsonConverter only accepts/writes object-shaped JSON, so valid string or null representations for this union will throw or serialize incorrectly.

Prompt for AI agents
Check if this issue is valid — if so, understand the root cause and fix it. At samples/client/petstore/csharp/generichost/latest/NullTypes/src/Org.OpenAPITools/Model/ColorOrNull.cs, line 111:

<comment>ColorOrNullJsonConverter only accepts/writes object-shaped JSON, so valid string or null representations for this union will throw or serialize incorrectly.</comment>

<file context>
@@ -0,0 +1,205 @@
+        {
+            int currentDepth = utf8JsonReader.CurrentDepth;
+
+            if (utf8JsonReader.TokenType != JsonTokenType.StartObject && utf8JsonReader.TokenType != JsonTokenType.StartArray)
+                throw new JsonException();
+
</file context>
Fix with Cubic

Originally posted by @cubic-dev-ai[bot] in https://github.com/OpenAPITools/openapi-generator/pull/23260#discussion_r2937210191

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start at samples/client/petstore/csharp/generichost/latest/NullTypes/src/Org.OpenAPITools/Model/ColorOrNull.cs around line 111 and inspect ColorOrNullJsonConverter. Reproduce the handling of string and null JSON representations, then verify that valid union values no longer throw or serialize as object-only data.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp
Domain
api
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
52/100

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