Field 'is_plugin' defined on a base class was overridden by a non-annotated attribute

[SimonBoothroyd]

Description

Interchange 0.4.0 seems to have introduced an odd incompatibility with pydantic

Reproduction

Please include a minimally reproducing example of this bug.

import openff.interchange
import openff.toolkit


openff.interchange.Interchange.from_smirnoff(
    openff.toolkit.ForceField("openff-2.0.0.offxml"),
    openff.toolkit.Molecule.from_smiles("CCO").to_topology(),
)

Output

Please include the output, including full tracebacks of any errors, resulting from the reproduction.

Traceback (most recent call last):
  File "/xxx/scratch/repro.py", line 13, in <module>
    main()
  File "/xxx/scratch/repro.py", line 6, in main
    openff.interchange.Interchange.from_smirnoff(
  File "/xxx/envs/smee/lib/python3.12/site-packages/openff/interchange/components/interchange.py", line 148, in from_smirnoff
    from openff.interchange.smirnoff._create import _create_interchange
  File "/xxx/envs/smee/lib/python3.12/site-packages/openff/interchange/smirnoff/_create.py", line 48, in <module>
    for collection_plugin in load_smirnoff_plugins():
                             ^^^^^^^^^^^^^^^^^^^^^^^
  File "/xxx/envs/smee/lib/python3.12/site-packages/openff/interchange/plugins/__init__.py", line 21, in load_smirnoff_plugins
    plugin_handlers.append(entry_point.load())
                           ^^^^^^^^^^^^^^^^^^
  File "/xxx/envs/smee/lib/python3.12/site-packages/importlib_metadata/__init__.py", line 189, in load
    module = import_module(match.group('module'))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/xxx/envs/smee/lib/python3.12/importlib/__init__.py", line 90, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/xxx/envs/smee/lib/python3.12/site-packages/smirnoff_plugins/collections/vsites.py", line 17, in <module>
    class _VsitePlugin(SMIRNOFFVirtualSiteCollection, abc.ABC):
  File "/xxx/envs/smee/lib/python3.12/site-packages/pydantic/_internal/_model_construction.py", line 115, in __new__
    private_attributes = inspect_namespace(
                         ^^^^^^^^^^^^^^^^^^
  File "/xxx/envs/smee/lib/python3.12/site-packages/pydantic/_internal/_model_construction.py", line 418, in inspect_namespace
    raise PydanticUserError(
pydantic.errors.PydanticUserError: Field 'is_plugin' defined on a base class was overridden by a non-annotated attribute. All field definitions, including overrides, require a type annotation.

For further information visit https://errors.pydantic.dev/2.9/u/model-field-overridden

Software versions

• Which operating system and version are you using? OSX
• How did you install Interchange? conda
• What is the output of running conda list?

griffe-pydantic           1.1.0              pyh3cfb1c2_0    conda-forge
pydantic                  2.9.2              pyhd8ed1ab_0    conda-forge
pydantic-core             2.23.4          py312he431725_0    conda-forge
pydantic-units            0.0.2              pyh3cfb1c2_0    conda-forge
openff-amber-ff-ports     0.0.4              pyhca7485f_0    conda-forge
openff-forcefields        2024.09.0          pyhff2d567_0    conda-forge
openff-interchange-base   0.4.0              pyhd8ed1ab_0    conda-forge
openff-models             0.1.2              pyhca7485f_0    conda-forge
openff-toolkit-base       0.16.6             pyhd8ed1ab_0    conda-forge
openff-units              0.2.2              pyhca7485f_0    conda-forge
openff-utilities          0.1.12             pyhd8ed1ab_0    conda-forge

[mattwthompson]

You should already have this in your inbox, but tagging for any future explorers of the corners of the Internet that Google nudges people toward: openforcefield/smirnoff-plugins#75