Question

在执行更新操作时，mutate函数需要很多参数。根据官方的石墨烯文档，我可以使用（ parent ， root ， obj ）对象访问我的类对象。

我尝试使用父级，根级和obj访问变量数据，但这没有用。

class UpdateEvent(graphene.Mutation):
    ok = graphene.Boolean()

    class Arguments:
        id = graphene.ID()
        name = graphene.String()

        event_start_date = graphene.types.datetime.Date()
        event_finish_date = graphene.types.datetime.Date()

        event_mark_as_finished = graphene.Boolean()

        event_description = graphene.String()

        event_location = graphene.String()

        event_price = graphene.Float()
        event_price_unit = graphene.String()


    def mutate(root, info):

       event = Events.objects.get(pk=root.id)
       event.name = root.name  
       event.event_start_date = root.event_start_date 
       event.event_finish_date= root.event_finish_date
       event.event_mark_as_finished = root.event_mark_as_finished
       event.event_description = root.event_description
       event.event_location = root.event_location
       event.event_price = root.event_price
       event.event_price_unit = root.event_price_unit
       event.save()


       # This class registered to the Mutation class***

"errors": [{ "message": "mutate() got an unexpected keyword argument 'event_description'"}]

将所有变量放入mutate函数中可以很好地工作，但这是一种丑陋的方式。我该如何处理？

Answer 1

用一种输入类型将它们包装起来：

class UpdateEventMutationInput(graphene.InputObjectType):
    id = graphene.ID()
    name = graphene.String()

    event_start_date = graphene.types.datetime.Date()
    event_finish_date = graphene.types.datetime.Date()
    event_mark_as_finished = graphene.Boolean()
    event_description = graphene.String()
    event_location = graphene.String()
    event_price = graphene.Float()
    event_price_unit = graphene.String()

并将其用于突变：

class UpdateEvent(graphene.Mutation):
    ok = graphene.Boolean()

    class Arguments:
        data = UpdateEventMutationInput(required=True)

    def mutate(root, info, data):
       event = Events.objects.get(pk=data.id)
       event.name = data.name  
       event.event_start_date = data.event_start_date 
       event.event_finish_date= data.event_finish_date
       event.event_mark_as_finished = data.event_mark_as_finished
       event.event_description = data.event_description
       event.event_location = data.event_location
       event.event_price = data.event_price
       event.event_price_unit = data.event_price_unit
       event.save()

它还具有以下优点：

变异少的代码
编写此突变的请求非常容易（它包含一个$data: UpdateEventMutationInput!变量）
较少的跨版本冲突，因为您无需在变异输入更改时更新请求

如何避免在mutate（）函数中使用太多参数？

1 个答案: