fix: add chat message name field (#8969)

* add-chat-message-name-field

* add release notes

* Update add-chat-message-name-field-a8ae96fb9ff13f7b.yaml

---------

Co-authored-by: Stefano Fiorucci <[email protected]>

Author: mdrazak2001

haystack/dataclasses/chat_message.py

@@ -371,6 +371,10 @@ def to_openai_dict_format(self) -> Dict[str, Any]:
 
         openai_msg: Dict[str, Any] = {"role": self._role.value}
 
+        # Add name field if present
+        if self._name is not None:
+            openai_msg["name"] = self._name
+
         if tool_call_results:
             result = tool_call_results[0]
             if result.origin.id is None:

releasenotes/notes/add-chat-message-name-field-a8ae96fb9ff13f7b.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    In the `ChatMessage.to_openai_dict_format` utility method,
+    include the `name` field in the returned dictionary, if present.
+    Previously, the `name` field was erroneously skipped.

test/dataclasses/test_chat_message.py

@@ -257,6 +257,12 @@ def test_to_openai_dict_format():
     )
     assert message.to_openai_dict_format() == {"role": "tool", "content": tool_result, "tool_call_id": "123"}
 
+    message = ChatMessage.from_user(text="I have a question", name="John")
+    assert message.to_openai_dict_format() == {"role": "user", "content": "I have a question", "name": "John"}
+
+    message = ChatMessage.from_assistant(text="I have an answer", name="Assistant1")
+    assert message.to_openai_dict_format() == {"role": "assistant", "content": "I have an answer", "name": "Assistant1"}
+
 
 def test_to_openai_dict_format_invalid():
     message = ChatMessage(_role=ChatRole.ASSISTANT, _content=[])