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A lightweight library for converting complex datatypes into native Python datatypes.

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  • License: MIT License (Copyright 2013 Steven Loria)
  • Author: Steven Loria
  • Tags serialization , rest , json , api , marshal , marshalling
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Project description

Latest version Travis-CI

Homepage: http://marshmallow.rtfd.org/

marshmallow is an ORM/ODM/framework-agnostic library for converting complex datatypes, such as objects, into native Python datatypes. The serialized objects can then be rendered to standard formats such as JSON for use in a REST API.

from datetime import datetime
from marshmallow import Serializer, fields, pprint

# A "model"
class Person(object):
    def __init__(self, name):
        self.name = name
        self.date_born = datetime.now()

# A serializer
class PersonSerializer(Serializer):
    name = fields.String()
    date_born = fields.DateTime()

person = Person("Guido van Rossum")
serialized = PersonSerializer(person)
pprint(serialized.data)
# {"name": "Guido van Rossum", "date_born": "Sun, 10 Nov 2013 14:24:50 -0000"}

Get It Now

$ pip install -U marshmallow

Documentation

Full documentation is available at http://marshmallow.rtfd.org/ .

Requirements

  • Python >= 2.6 or >= 3.3

marshmallow has no external dependencies outside of the Python standard library.

License

MIT licensed. See the bundled LICENSE file for more details.

Changelog

0.5.4 (2014-04-17)

  • Add json_module class Meta option.

  • Add required option to fields . Thanks @DeaconDesperado.

  • Tested on Python 3.4 and PyPy.

0.5.3 (2014-03-02)

  • Fix Integer field default. It is now 0 instead of 0.0. Thanks @kalasjocke

  • Add context param to Serializer. Allows accessing arbitrary objects in Function and Method fields.

  • Function and Method fields raise MarshallingError if their argument is uncallable.

0.5.2 (2014-02-10)

  • Enable custom field validation via the validate parameter.

  • Add utils.from_rfc for parsing RFC datestring to Python datetime object.

0.5.1 (2014-02-02)

  • Avoid unnecessary attribute access in utils.to_marshallable_type for improved performance.

  • Fix RFC822 formatting for localized datetimes.

0.5.0 (2013-12-29)

  • Can customize validation error messages by passing the error parameter to a field.

  • Backwards-incompatible: Rename fields.NumberField -> fields.Number.

  • Add fields.Select. Thanks @ecarreras.

  • Support nesting a Serializer within itself by passing "self" into fields.Nested (only up to depth=1).

  • Backwards-incompatible: No implicit serializing of collections. Must set many=True if serializing to a list. This ensures that marshmallow handles singular objects correctly, even if they are iterable.

  • If Nested field only parameter is a field name, only return a single value for the nested object (instead of a dict) or a flat list of values.

  • Improved performance and stability.

0.4.1 (2013-12-01)

  • An object’s __marshallable__ method, if defined, takes precedence over __getitem__.

  • Generator expressions can be passed to a serializer.

  • Better support for serializing list-like collections (e.g. ORM querysets).

  • Other minor bugfixes.

0.4.0 (2013-11-24)

  • Add additional clas Meta option.

  • Add dateformat class Meta option.

  • Support for serializing UUID, date, time, and timedelta objects.

  • Remove Serializer.to_data method. Just use Serialize.data property.

  • String field defaults to empty string instead of None.

  • Backwards-incompatible: isoformat and rfcformat functions moved to utils.py.

  • Backwards-incompatible: Validation functions moved to validate.py.

  • Backwards-incompatible: Remove types.py.

  • Reorder parameters to DateTime field (first parameter is dateformat).

  • Ensure that to_json returns bytestrings.

  • Fix bug with including an object property in fields Meta option.

  • Fix bug with passing None to a serializer.

0.3.1 (2013-11-16)

  • Fix bug with serializing dictionaries.

  • Fix error raised when serializing empty list.

  • Add only and exclude parameters to Serializer constructor.

  • Add strict parameter and option: causes Serializer to raise an error if invalid data are passed in, rather than storing errors.

  • Updated Flask + SQLA example in docs.

0.3.0 (2013-11-14)

  • Declaring Serializers just got easier. The class Meta paradigm allows you to specify fields more concisely. Can specify fields and exclude options.

  • Allow date formats to be changed by passing format parameter to DateTime field constructor. Can either be "rfc" (default), "iso", or a date format string.

  • More useful error message when declaring fields as classes (instead of an instance, which is the correct usage).

  • Rename MarshallingException -> MarshallingError.

  • Rename marshmallow.core -> marshmallow.serializer.

0.2.1 (2013-11-12)

  • Allow prefixing field names.

  • Fix storing errors on Nested Serializers.

  • Python 2.6 support.

0.2.0 (2013-11-11)

  • Field-level validation.

  • Add fields.Method.

  • Add fields.Function.

  • Allow binding of extra data to a serialized object by passing the extra param when initializing a Serializer.

  • Add relative paramater to fields.Url that allows for relative URLs.

0.1.0 (2013-11-10)

  • First release.

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