[WIP] Upgrade to support both Pydantic v1 and v2

[AntonDeMeester]

Upgrades to Pydantic 2, using the new pydantic models. This also includes support for Pydantic v1.

[github-actions]

📝 Docs preview for commit e2d4d1f at: https://003fc64c.sqlmodel.pages.dev

[stintel]

Hey, we're currently investigating to use SQLModel in Willow Application Server. As we're doing some latency sensitive stuff in there, we'd really like to use Pydantic 2, so I gave this PR a try. Creating a table and inserting records seems to work, but when trying a select we hit the following exception:

[2023-11-30T17:41:05] ERROR:    Exception in ASGI application
Traceback (most recent call last):
  File "/usr/local/lib/python3.12/site-packages/uvicorn/protocols/http/httptools_impl.py", line 426, in run_asgi
    result = await app(  # type: ignore[func-returns-value]
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/uvicorn/middleware/proxy_headers.py", line 84, in __call__
    return await self.app(scope, receive, send)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/fastapi/applications.py", line 292, in __call__
    await super().__call__(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/applications.py", line 122, in __call__
    await self.middleware_stack(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 184, in __call__
    raise exc
  File "/usr/local/lib/python3.12/site-packages/starlette/middleware/errors.py", line 162, in __call__
    await self.app(scope, receive, _send)
  File "/usr/local/lib/python3.12/site-packages/starlette/middleware/cors.py", line 83, in __call__
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 79, in __call__
    raise exc
  File "/usr/local/lib/python3.12/site-packages/starlette/middleware/exceptions.py", line 68, in __call__
    await self.app(scope, receive, sender)
  File "/usr/local/lib/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 20, in __call__
    raise e
  File "/usr/local/lib/python3.12/site-packages/fastapi/middleware/asyncexitstack.py", line 17, in __call__
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 718, in __call__
    await route.handle(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 276, in handle
    await self.app(scope, receive, send)
  File "/usr/local/lib/python3.12/site-packages/starlette/routing.py", line 66, in app
    response = await func(request)
               ^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/fastapi/routing.py", line 273, in app
    raw_response = await run_endpoint_function(
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/fastapi/routing.py", line 190, in run_endpoint_function
    return await dependant.call(**values)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/app/routers/config.py", line 57, in api_get_config
    config = get_config_from_db_pydantic()
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/app/app/internal/was.py", line 117, in get_config_from_db_pydantic
    statement = select(ConfigTablePydantic).where(ConfigTablePydantic.config_type == "config")
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.12/site-packages/sqlmodel/sql/expression.py", line 429, in select
    return SelectOfScalar._create(*entities, **kw)  # type: ignore
           ^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'SelectOfScalar' has no attribute '_create'. Did you mean: '_correlate'?

I understand this is a WIP, so my question is: do you have a rough estimate of when this would be ready?

[AntonDeMeester]

See proper PR from @tiangolo here

[tiangolo]

Thank you for your work @AntonDeMeester! I included your commits in #722 (you can see your badge now says "Contributor" 😎 ), I changed a few extra things, more details in that PR. It's now released and available as SQLModel 0.0.14! 🎉 🌮