Update a trace

[saiprasath21]

I have a trace_id and want to fetch the corresponding trace. This is possible using the python sdk.
However, can I update some information of this trace such as metadata?

[dosubot[bot]]

Hey @saiprasath21! How can I assist you today? If you have any questions or need help with anything, feel free to ask.

Yes, you can update the metadata of a trace using the Python SDK if you have the trace_id. You can do this by using the trace.update() method or by directly specifying the trace_id when creating or updating a trace. Here is an example of how you can update a trace using the trace_id:

# option 2: via trace_id, trace is upserted on id
langfuse.trace(id=trace_id, metadata={"new_key": "new_value"})

This code snippet demonstrates how to update the metadata of a trace by specifying the trace_id and providing the new metadata as a JSON object ^[1].

To continue talking to Dosu, mention @dosu.

[iamheavymetalx7]

what is it for javascript?

[iamheavymetalx7]

@marcklingen

[marcklingen]

Can you share what your question is, I am unsure whether I understand you @iamheavymetalx7

[pedroallenrevez]

Can we update the id of a trace?

[marcklingen]

No, ids are immutable

[JONCZYKMaciejOrange]

when I use

langfuse_context.update_current_trace(
        metadata={"key1": "value1"}
    )

and then in another @observe()'ed function I use

langfuse_context.update_current_trace(
        metadata={"key2": "value2"}
    ) 

At the end of the trace my metadata only consist of
#metadata == {"key2":"value2"}
as all previous additions to metadata were overwritten.

is that supposed to happen?
it looks as dictionary so adding value to another key seems old ones should be left untouched.

And even if overwriting is decided then being able to READ metadata of a current trace first would be helpful to prepare NEW metadata with possible decision to save or not some of its data.

[marcklingen]

I've created an issue to track this: #4882

[hassiebp]

This is fixed in https://github.com/langfuse/langfuse-python/releases/tag/v2.57.12