Source code for cattr.preconf.bson
"""Preconfigured converters for bson."""
from datetime import datetime
from typing import Any
from .._compat import Set, is_mapping
from ..converters import GenConverter
from . import validate_datetime
[docs]def configure_converter(converter: GenConverter):
"""
Configure the converter for use with the bson library.
* sets are serialized as lists
* non-string mapping keys are coerced into strings when unstructuring
"""
def gen_unstructure_mapping(cl: Any, unstructure_to=None):
key_handler = str
args = getattr(cl, "__args__", None)
if args and issubclass(args[0], str):
key_handler = None
return converter.gen_unstructure_mapping(
cl, unstructure_to=unstructure_to, key_handler=key_handler
)
converter._unstructure_func.register_func_list(
[(is_mapping, gen_unstructure_mapping, True)]
)
converter.register_structure_hook(datetime, validate_datetime)
[docs]def make_converter(*args, **kwargs) -> GenConverter:
kwargs["unstruct_collection_overrides"] = {
**kwargs.get("unstruct_collection_overrides", {}),
Set: list,
}
res = GenConverter(*args, **kwargs)
configure_converter(res)
return res