🚑 Fix embed timestamp JSON serialization (#85)

Author: shoucandanghehe

nonebot/adapters/discord/utils.py

@@ -1,3 +1,4 @@
+from datetime import date, datetime, time
 from typing import Any
 import zlib
 
@@ -22,6 +23,20 @@ def omit_unset(data: Any) -> Any:  # noqa: ANN401
     return data
 
 
+def _serialize_datetime_values(data: Any) -> Any:  # noqa: ANN401
+    """Recursively convert datetime-like values into JSON-safe strings."""
+
+    if isinstance(data, dict):
+        return data.__class__(
+            (k, _serialize_datetime_values(v)) for k, v in data.items()
+        )
+    if isinstance(data, list | tuple | set):
+        return data.__class__(_serialize_datetime_values(i) for i in data)
+    if isinstance(data, datetime | date | time):
+        return data.isoformat()
+    return data
+
+
 def model_dump(  # noqa: PLR0913
     model: BaseModel,
     include: set[str] | None = None,
@@ -43,8 +58,8 @@ def model_dump(  # noqa: PLR0913
         exclude_none=exclude_none,
     )
     if omit_unset_values:
-        return omit_unset(data)
-    return data
+        data = omit_unset(data)
+    return _serialize_datetime_values(data)
 
 
 def escape(s: str) -> str:

tests/test_api_nullability.py

@@ -1,3 +1,4 @@
+from datetime import datetime, timezone
 import json
 
 from nonebot.adapters.discord.api import (
@@ -7,6 +8,7 @@
     SelectOption,
 )
 from nonebot.adapters.discord.api.model import (
+    Embed,
     ExecuteWebhookParams,
     File,
     MessageEditParams,
@@ -42,6 +44,16 @@ def test_parse_data_execute_webhook_omits_unset_fields() -> None:
     assert payload == {}
 
 
+def test_parse_data_serializes_embed_timestamp() -> None:
+    timestamp = datetime(2026, 3, 14, 12, 0, tzinfo=timezone.utc)
+    payload = parse_data(
+        {"embeds": [Embed(timestamp=timestamp)]},
+        MessageSend,
+    )["json"]
+
+    assert payload["embeds"][0]["timestamp"] == timestamp.isoformat()
+
+
 def test_parse_data_multipart_keeps_null_attachments() -> None:
     res = parse_data(
         {
@@ -103,6 +115,22 @@ def test_parse_forum_thread_message_without_content() -> None:
     assert payload["message"] == {}
 
 
+def test_parse_forum_thread_message_serializes_embed_timestamp_in_multipart() -> None:
+    timestamp = datetime(2026, 3, 14, 12, 0, tzinfo=timezone.utc)
+    res = parse_forum_thread_message(
+        {
+            "name": "thread-name",
+            "files": [File(content=b"1", filename="a.txt")],
+            "embeds": [Embed(timestamp=timestamp)],
+        }
+    )
+    multipart = res["files"]
+    _, payload_json, _ = multipart["payload_json"]
+    payload = json.loads(payload_json)
+
+    assert payload["message"]["embeds"][0]["timestamp"] == timestamp.isoformat()
+
+
 def test_parse_forum_thread_message_maps_message_attachment_id() -> None:
     res = parse_forum_thread_message(
         {