custom-field-serializer.md

Custom field (de)serializer

If you want to provide a custom function to override the default (de)serialization behaviour of a field, you can pass your functions to serializer and deserializer in serde.field.

from dataclasses import dataclass
from serde import serde, field

@serde
@dataclass
class Foo:
    dt1: datetime
    dt2: datetime = field(
        serializer=lambda x: x.strftime('%d/%m/%y'), deserializer=lambda x: datetime.strptime(x, '%d/%m/%y')
    )

dt1 in the example will serialized into 2021-01-01T00:00:00 because the pyserde's default (de)serializer for datetime is ISO 8601. dt2 field in the example will be serialized into 01/01/21 by the custom field serializer.

For complete example, please see examples/custom_field_serializer.py