Created
May 7, 2024 05:46
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Convert dataclasses to strawberry types
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from collections.abc import Callable | |
from typing import Literal, dataclass_transform | |
import strawberry | |
from strawberry.type import get_object_definition | |
@dataclass_transform() | |
def dataclass_to_strawberry[T: type](kind: Literal["input", "type"] = "type") -> Callable[[T], T]: | |
def inner(cls: T) -> T: | |
strawberry_bases = [] | |
extend_dict = {} | |
extended_annotations = {} | |
for klass in reversed(cls.__bases__): | |
if get_object_definition(klass): | |
strawberry_bases.append(klass) | |
else: | |
extend_dict.update(klass.__dict__) | |
extended_annotations.update(klass.__annotations__) | |
# strawberry doesn't support slots | |
# so we need to remove them from the class | |
# before passing it to strawberry | |
extend_dict.pop("__slots__", None) | |
extended_annotations.update(cls.__annotations__) | |
# remove dataclasses fields from the class | |
extend_dict = { | |
k: v | |
for k, v in extend_dict.items() | |
if k not in extended_annotations and not k.startswith("__dataclass") | |
} | |
extend_dict.pop("__dataclasses_fields", None) | |
extend_dict.pop("__init__", None) | |
extend_dict.pop("__dict__", None) | |
cls.__annotations__ = extended_annotations | |
extend_dict.update(cls.__dict__) | |
return strawberry.type( | |
type(cls.__name__, tuple(strawberry_bases), extend_dict), is_input=kind == "input" | |
) | |
return inner | |
@dataclass_transform() | |
def dataclass_to_strawberry_input[T: type]() -> Callable[[T], T]: | |
def inner(cls: T) -> T: | |
return dataclass_to_strawberry("input")(cls) | |
return inner |
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