Enum is a special
GraphQL type that represents a set of
symbolic names (members) bound to unique, constant values.
You can create an
Enum using classes:
import graphene class Episode(graphene.Enum): NEWHOPE = 4 EMPIRE = 5 JEDI = 6
But also using instances of Enum:
Episode = graphene.Enum('Episode', [('NEWHOPE', 4), ('EMPIRE', 5), ('JEDI', 6)])
It’s possible to add a description to an enum value, for that the enum value
needs to have the
description property on it.
class Episode(graphene.Enum): NEWHOPE = 4 EMPIRE = 5 JEDI = 6 @property def description(self): if self == Episode.NEWHOPE: return 'New Hope Episode' return 'Other episode'
Usage with Python Enums¶
In case the Enums are already defined it’s possible to reuse them using
Enum.from_enum supports a
deprecation_reason lambdas as input so
you can add description etc. to your enum without changing the original:
graphene.Enum.from_enum( AlreadyExistingPyEnum, description=lambda v: return 'foo' if v == AlreadyExistingPyEnum.Foo else 'bar')
enum.Enum internally (or a backport if
that’s not available) and can be used in a similar way, with the exception of
In the Python
Enum implementation you can access a member by initing the Enum.
from enum import Enum class Color(Enum): RED = 1 GREEN = 2 BLUE = 3 assert Color(1) == Color.RED
However, in Graphene
Enum you need to call get to have the same effect:
from graphene import Enum class Color(Enum): RED = 1 GREEN = 2 BLUE = 3 assert Color.get(1) == Color.RED