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docs: Update pydantic compatibility (#25145)

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Update pydantic compatibility
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Eugene Yurtsev 2024-08-08 12:10:44 -04:00 committed by GitHub
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docs/docs/how_to/pydantic_compatibility.md
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@ -13,9 +13,14 @@ the v1 namespace of Pydantic 2.
Because Pydantic does not support mixing .v1 and .v2 objects, users should be aware of a number of issues
when using LangChain with Pydantic.
:::caution
While LangChain supports Pydantic V2 objects in some APIs (listed below), it's suggested that users keep using Pydantic V1 objects until LangChain 0.3 is released.
:::
## 1. Passing Pydantic objects to LangChain APIs
Most LangChain APIs that accept Pydantic objects have been updated to accept both Pydantic v1 and v2 objects.
Most LangChain APIs for *tool usage* (see list below) have been updated to accept either Pydantic v1 or v2 objects.
* Pydantic v1 objects correspond to subclasses of `pydantic.BaseModel` if `pydantic 1` is installed or subclasses of `pydantic.v1.BaseModel` if `pydantic 2` is installed.
* Pydantic v2 objects correspond to subclasses of `pydantic.BaseModel` if `pydantic 2` is installed.