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Fix placeholder deep copy (#611)

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* Fix placeholder deep copy

* Add annotations, __repr__ and __slots__

Co-authored-by: James Hilton-Balfe <gobot1234yt@gmail.com>

* Fix annotation

* Fix typing

---------

Co-authored-by: James Hilton-Balfe <gobot1234yt@gmail.com>
This commit is contained in:
Adrien 2024-09-18 13:56:51 +02:00 committed by GitHub
parent 8d25c96cea
commit 1161803069
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1 changed files with 17 additions and 2 deletions
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19
src/betterproto/__init__.py
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@ -169,7 +169,22 @@ class Casing(builtin_enum.Enum):
SNAKE = snake_case #: A snake_case sterilization function.
PLACEHOLDER: Any = object()
class Placeholder:
__slots__ = ()
def __repr__(self) -> str:
return "<PLACEHOLDER>"
def __copy__(self) -> Self:
return self
def __deepcopy__(self, _) -> Self:
return self
# We can't simply use object() here because pydantic automatically performs deep-copy of mutable default values
# See #606
PLACEHOLDER: Any = Placeholder()
@dataclasses.dataclass(frozen=True)
@ -206,7 +221,7 @@ def dataclass_field(
) -> dataclasses.Field:
"""Creates a dataclass field with attached protobuf metadata."""
return dataclasses.field(
default=None if optional else PLACEHOLDER,
default=None if optional else PLACEHOLDER, # type: ignore
metadata={
"betterproto": FieldMetadata(
number, proto_type, map_types, group, wraps, optional