Structured Output component wrong 'content'

[mirco-gnuva]

Bug Description

Hello!

Langflow version: langflowai/langflow-nightly:v1.1.0.dev4 (Docker)

I designed a flow that uses:

• OpenAI component with gpt-4o-mini
• Structured Output component

I'm facing the following strange behaviour:

Schema A

Name	Description	Type	Multiple
title		text	False
article		text	False

with that schema all works as expected

Schema B

Name	Description	Type	Multiple
title		text	False
content		text	False

The following Error is raised: Error building Component Structured Output: Output should be a Pydantic BaseModel, got <class 'str'> <the string that with the A schema is the 'article' key value>

Conclusion

I suspect that under the hood the completion.choices[0].content.content is returned (in other words, the 'content' attribute of the resulting Pydantic object) instead of the resulting Pydantic object itself.

Reproduction

Expected behavior

The Structured Output component runs successfully with the following schema:	Name	Description	Type	Multiple
title		text	False
article		text	False

Who can help?

No response

Operating System

Docker

Langflow Version

1.1.0.dev4

Python Version

None

Screenshot

No response

Flow File

No response

[dosubot[bot]]

Hey there, @mirco-gnuva! I'm here to help you with any bugs, questions, or contributions you have. Let's squash those bugs together!

The issue you're encountering with the Structured Output component seems to be related to the handling of the 'content' field. In Langflow, the 'content' field is subject to a custom serialization process, which might be causing the unexpected behavior you're seeing when using Schema B. The BaseContent class includes a serialize_model method that attempts to serialize the model using jsonable_encoder with custom encoders. If an exception occurs, it falls back to a default serialization method ^[1].

This custom handling could be affecting how the 'content' field is processed, leading to the error where a string is returned instead of a Pydantic BaseModel. To resolve this, you might consider checking if there are any specific transformations or custom encodings applied to the 'content' field that could be interfering with its expected behavior in the Structured Output component.

To continue talking to Dosu, mention @dosu.