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Enum field for Marshmallow

Project description


Enum field for use with Marshmallow.


pip install --user marshmallow_enum

If you're on a version before 3.4, you'll also need to install enum34.

Using The Field

To make use of the field, you must have an existing Enum:

from enum import Enum

class StopLight(Enum):
    green = 1
    yellow = 2
    red = 3

Then, declare it as a field in a schema:

from marshmallow import Schema
from marshmallow_enum import EnumField

class TrafficStop(Schema):
    light_color = EnumField(StopLight)

By default, the field will load and dump based on the name given to an enum value.

schema = TrafficStop()
# {'light_color': 'red'}

schema.load({'light_color': 'red'}).data
# {'light_color':}

Customizing loading and dumping behavior

To customize how an enum is serialized or deserialized, there are three options:

  • Setting by_value=True. This will cause both dumping and loading to use the value of the enum.
  • Setting load_by=EnumField.VALUE. This will cause loading to use the value of the enum.
  • Setting dump_by=EnumField.VALUE. This will cause dumping to use the value of the enum.

If either load_by or dump_by are unset, they will follow from by_value.

Additionally, there is EnumField.NAME to be explicit about the load and dump behavior, this is the same as leaving both by_value and either load_by and/or dump_by unset.

Custom Error Message

A custom error message can be provided via the error keyword argument. It can accept three format values:

  • {input}: The value provided to the schema field
  • {names}: The names of the individual enum members
  • {values}: The values of the individual enum members

Previously, the following inputs were also available but are deprecated and will be removed in 1.6:

  • {name}
  • {value}
  • {choices}

Version 1.5

Allow unicode enum values (sergeyzsg) Add support for Marshmallow 3 (svidela)

Version 1.4

  • Deprecate the {choices}, {name} and {value} format keys for custom error messages
  • Allow configure loading and dumping independently

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