graphene-python学习笔记（2）Enum

Types:

• Enums
• Scalars
• Lists and Non-Null
• ObjectTypes
• Interfaces
• Unions
• Schema
• Mutations
• AbstractTypes

 

一、Enums

定义Enum的两种方式

import graphene

class Episode(graphene.Enum):
    NEWHOPE = 4
    EMPIRE = 5
    JEDI = 6

　　或者

Episode = graphene.Enum('Episode', [('NEWHOPE', 4), ('EMPIRE', 5), ('JEDI', 6)])

　　

可以为每个枚举类型添加说明，使用description属性

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'

　　重用已经定义的Enum

graphene.Enum.from_enum(AlreadyExistingPyEnum)

　　注意：graphene.Enum使用了python 的enum.Enum内核，有点不同的是，python中不需要使用get,而grphene.Enum需要使用

from enum import Enum
class Color(Enum):
    RED = 1
    GREEN = 2
    BLUE = 3

assert Color(1) == Color.RED

　　在graphene中

from graphene import Enum
class Color(Enum):
    RED = 1
    GREEN = 2
    BLUE = 3

assert Color.get(1) == Color.RED