_dump_pydantic_models() — langchain Function Reference

Architecture documentation for the _dump_pydantic_models() function in dump.py from the langchain codebase.

Function python CoreAbstractions Serialization called by 2

Entity Profile

CoreAbstractions→ Serialization→ _dump_pydantic_models() — langchain Function Reference

Dependency Diagram

graph TD
  5cbc4686_165a_f32c_5474_0a55a2f6b29d["_dump_pydantic_models()"]
  a51258b9_512f_dc1c_b25c_dc1d97b3a5d8["dump.py"]
  5cbc4686_165a_f32c_5474_0a55a2f6b29d -->|defined in| a51258b9_512f_dc1c_b25c_dc1d97b3a5d8
  46e40d05_c4e1_f364_4649_1ff3401a3e37["dumps()"]
  46e40d05_c4e1_f364_4649_1ff3401a3e37 -->|calls| 5cbc4686_165a_f32c_5474_0a55a2f6b29d
  66a960cf_c531_d600_1a66_6777acc56b51["dumpd()"]
  66a960cf_c531_d600_1a66_6777acc56b51 -->|calls| 5cbc4686_165a_f32c_5474_0a55a2f6b29d
  style 5cbc4686_165a_f32c_5474_0a55a2f6b29d fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/load/dump.py lines 43–67

def _dump_pydantic_models(obj: Any) -> Any:
    """Convert nested Pydantic models to dicts for JSON serialization.

    Handles the special case where a `ChatGeneration` contains an `AIMessage`
    with a parsed Pydantic model in `additional_kwargs["parsed"]`. Since
    Pydantic models aren't directly JSON serializable, this converts them to
    dicts.

    Args:
        obj: The object to process.

    Returns:
        A copy of the object with nested Pydantic models converted to dicts, or
            the original object unchanged if no conversion was needed.
    """
    if (
        isinstance(obj, ChatGeneration)
        and isinstance(obj.message, AIMessage)
        and (parsed := obj.message.additional_kwargs.get("parsed"))
        and isinstance(parsed, BaseModel)
    ):
        obj_copy = obj.model_copy(deep=True)
        obj_copy.message.additional_kwargs["parsed"] = parsed.model_dump()
        return obj_copy
    return obj