Pydantic 2

[kreneskyp]

Description

LangChain .0.0.268 enabled Pydantic 2 but supports v1 and v2. This PR updates IX to pydantic 2.

Langchain is not forcing v2 yet but trying to stay ahead of the game here.

Changes

• various changes for Pydantic2.0 support

How Tested

• unittests pass
• manual testing
  • first pass smoke test: editor, chat, agent functionality tested manually and revealed a number of v2 incompatibilities not covered by unittests. all fixed. More thorough tested needed of different components.
  • @moderator
  • @pirate - memory sessions
  • @code - openai functions, artifact memory
  • @klarna / @botsmith: openAPI functions
  • @wikipedia - openai functions agent
  • @retrieval - retrieval components

TODOs

• chromdb==0.4.6 does not support pydantic2. This is a blocker for upgrade unless a workaround can be found.

• OpenAPI chains aren't compatible with pydantic2 yet because OpenAPISpec doesn't yet have support:

  Error

  AttributeError: type object 'OpenAPISpec' has no attribute 'from_url'
  

  Upstream fix: Pydantic v2 support for OpenAPI Specs langchain-ai/langchain#11936

[kreneskyp]

This will be put on hold for a while. LangChain should support v1 through end of year to give other projects like Chroma the time to migrate.

There will likely be some bit-rot in that time but this was only 1 day of work.

langchain-ai/langchain#9337