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from collections.abc import Mapping
from typing import Annotated, Any, Generic, TypeVar
from django.db.models.base import Model
# Really, we would like to use TypedDict as a bound, but it's not possible
_Annotations = TypeVar("_Annotations", covariant=True, bound=Mapping[str, Any])
class Annotations(Generic[_Annotations]):
"""Use as `Annotations[MyTypedDict]`"""
pass
_T = TypeVar("_T", bound=Model)
WithAnnotations = Annotated[_T, Annotations[_Annotations]]
"""Alias to make it easy to annotate the model `_T` as having annotations
`_Annotations` (a `TypedDict`).
Use as `WithAnnotations[MyModel, MyTypedDict]`.
"""
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