pydantic field_validators should be @classmethods

[sneakers-the-rat]

pydantic docs read:

@field_validators are "class methods", so the first argument value they receive is the UserModel class, not an instance of UserModel. We recommend you use the @classmethod decorator on them below the @field_validator decorator to get proper type checking.

Specifically here:

• curies/src/curies/api.py

  Line 277 in 470f71a

  @field_validator("prefix_synonyms") # type:ignore

• curies/src/curies/api.py

  Line 285 in 470f71a

  @field_validator("uri_prefix_synonyms") # type:ignore

importing with pydantic 2.8 yields:

  File "python3.11/site-packages/linkml_runtime/__init__.py", line 3, in <module>
    from linkml_runtime.utils.schemaview import SchemaView
  File "python3.11/site-packages/linkml_runtime/utils/schemaview.py", line 12, in <module>
    from linkml_runtime.utils.namespaces import Namespaces
  File "python3.11/site-packages/linkml_runtime/utils/namespaces.py", line 8, in <module>
    from prefixmaps.io.parser import load_context
  File "python3.11/site-packages/prefixmaps/__init__.py", line 1, in <module>
    from .datamodel.context import Context, PrefixExpansion, StatusType
  File "python3.11/site-packages/prefixmaps/datamodel/context.py", line 10, in <module>
    import curies
  File "python3.11/site-packages/curies/__init__.py", line 5, in <module>
    from .api import (
  File "/python3.11/site-packages/curies/api.py", line 252, in <module>
    class Record(BaseModel):  # type:ignore
  File "python3.11/site-packages/pydantic/_internal/_model_construction.py", line 96, in __new__
    private_attributes = inspect_namespace(
                         ^^^^^^^^^^^^^^^^^^
  File "python3.11/site-packages/pydantic/_internal/_model_construction.py", line 401, in inspect_namespace
    raise PydanticUserError(
pydantic.errors.PydanticUserError: A non-annotated attribute was detected: `prefix_not_in_synonyms = pydantic.functional_validators.field_validator`. All model fields require a type annotation; if `prefix_not_in_synonyms` is not meant to be a field, you may be able to resolve this error by annotating it as a `ClassVar` or updating `model_config['ignored_types']`.

For further information visit https://errors.pydantic.dev/2.8/u/model-field-missing-annotation

simple fix - add @classmethod underneath

[sneakers-the-rat]

the dependency spec is too generous re: pydantic version too -

curies/setup.cfg

Line 58 in 470f71a

pydantic

changes like these add up, and the package is no longer compatible with pydantic v1 ;) - def recommend dropping support, it's been more than a year

[cthoyt]

Thanks @sneakers-the-rat for investigating this and sending a fix. I will make a new release now, but have also added a pending deprecation in b8d500a for the end of October coincident with dropping py38 support.