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68 lines
1.4 KiB
ReStructuredText
68 lines
1.4 KiB
ReStructuredText
Enums
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=====
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A ``Enum`` is a special ``GraphQL`` type that represents a set of
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symbolic names (members) bound to unique, constant values.
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Definition
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----------
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You can create an ``Enum`` using classes:
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.. code:: python
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import graphene
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class Episode(graphene.Enum):
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NEWHOPE = 4
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EMPIRE = 5
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JEDI = 6
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But also using instances of Enum:
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.. code:: python
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Episode = graphene.Enum('Episode', [('NEWHOPE', 4), ('EMPIRE', 5), ('JEDI', 6)])
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Value descriptions
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------------------
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It's possible to add a description to a enum value, for that the the enum value
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needs to have the ``description`` property on it.
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.. code:: python
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class Episode(graphene.Enum):
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NEWHOPE = 4
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EMPIRE = 5
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JEDI = 6
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@property
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def description(self):
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if self == Episode.NEWHOPE:
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return 'New Hope Episode'
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return 'Other episode'
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Usage with Python Enums
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-----------------------
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In case that the Enums are already defined it's possible to reuse them using
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the ``Enum.from_enum`` function.
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.. code:: python
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graphene.Enum.from_enum(AlreadyExistingPyEnum)
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Notes
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-----
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Internally, ``graphene.Enum`` uses `enum.Enum`_ Python
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implementation if available, or a backport if not.
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So you can use it in the same way as you would do with Python
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``enum.Enum``.
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.. _``enum.Enum``: https://docs.python.org/3/library/enum.html
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