Compatibility Issue with Pydantic 2

[Pentusha]

The major version of Pydantic was recently released and lost backward compatibility. In particular, the .from_pydantic method stopped working for providers.Configuration due to the fact that the BaseSettings class now needs to be imported from a new package called pydantic-settings.

[tool.poetry.dependencies]
python = "^3.11"
pydantic = "^2.0.3"
pydantic-settings = "^2.0.2"

Traceback (most recent call last):
  File "<frozen runpy>", line 189, in _run_module_as_main
  File "<frozen runpy>", line 112, in _get_module_details
  File "/home/pentusha/projects/kyt.service-template/app/__init__.py", line 4, in <module>
    from app.core.containers import app_container
  File "/home/pentusha/projects/kyt.service-template/app/core/containers.py", line 80, in <module>
    app_container = AppContainer()
                    ^^^^^^^^^^^^^^
  File "src/dependency_injector/containers.pyx", line 742, in dependency_injector.containers.DeclarativeContainer.__new__
  File "src/dependency_injector/containers.pyx", line 393, in dependency_injector.containers.DynamicContainer.load_config
  File "src/dependency_injector/providers.pyx", line 2106, in dependency_injector.providers.Configuration.load
  File "src/dependency_injector/providers.pyx", line 2381, in dependency_injector.providers.Configuration.from_pydantic
  File "/home/pentusha/.cache/pypoetry/virtualenvs/kyt-service-template-cl7ERtKI-py3.11/lib/python3.11/site-packages/pydantic/__init__.py", line 207, in __getattr__
    return _getattr_migration(attr_name)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pentusha/.cache/pypoetry/virtualenvs/kyt-service-template-cl7ERtKI-py3.11/lib/python3.11/site-packages/pydantic/_migration.py", line 288, in wrapper
    raise PydanticImportError(
pydantic.errors.PydanticImportError: `BaseSettings` has been moved to the `pydantic-settings` package. See https://docs.pydantic.dev/2.0.3/migration/#basesettings-has-moved-to-pydantic-settings for more details.

[Pentusha]

If anyone is interested in a workaround with monkeypatch:

import pydantic
from pydantic_settings import BaseSettings

pydantic.BaseSettings = BaseSettings


class AppContainer(containers.DeclarativeContainer):
    config = providers.Configuration(strict=True)
    env = providers.Configuration(strict=True, pydantic_settings=[env_secrets])
    ...

[ZipFile]

You do not really need to monkeypatch anything:

-container.config.from_pydantic(settings)
+container.config.from_dict(settings.model_dump())

from_pydantic did essentially the same:

python-dependency-injector/src/dependency_injector/providers.pyx

Line 1818 in cc2304e

self.from_dict(settings.dict(**kwargs), required=required)

[akalex]

Hey @rmk135,
Any chance that this issue will be considered soon?
Many thanks for considering this request.

[abdalazizrashid]

Is this package maintained?

[Pentusha]

@abdalazizrashid seems like no. You can switch to my fork, but only python3.12 compatibility was introduces compared to original repo.

[rmk135]

Hi all! I looked into this issue today. I have a working example with pydantic version 2 on my machine. It will take some time to productize it, update the docs, etc. I think it's possible to make it work seamlessly with both pydantic version 1 and version 2.

[rmk135]

FYI all, there has been a nice PR already created for this: #768 (comment)

It has some merge conflicts, but we can make it work one way or another.

[ZipFile]

Fixed in #832, available since v4.44.0.