fix(openai): Ensure usage_metadata is serialized when invoking (#6966)

langchain-ai · Oct 11, 2024 · 763ef92 · 763ef92
1 parent ff85bbc
commit 763ef92
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/libs/langchain-openai/src/chat_models.ts b/libs/langchain-openai/src/chat_models.ts
@@ -1506,6 +1506,11 @@ export class ChatOpenAI<
         if (isAIMessage(generation.message)) {
           generation.message.usage_metadata = usageMetadata;
         }
+        // Fields are not serialized unless passed to the constructor
+        // Doing this ensures all fields on the message are serialized
+        generation.message = new AIMessage({
+          ...generation.message,
+        });
         generations.push(generation);
       }
       return {