Usage

To use marshmallow-union in a project:

import marshmallow_union


class PersonSchema(marshmallow.Schema):
        name = marshmallow.fields.String()
        number_or_numbers = marshmallow_union.Union(
                [
                        marshmallow.fields.List(marshmallow.fields.Integer()),
                        marshmallow.fields.Integer(),
                ],
                reverse_serialize_candidates=True,
        )


data = {"name": "Alice", "number_or_numbers": 25}
schema = PersonSchema()

loaded = schema.load(data)
dumped = schema.dump(data)