如何避免在 mutate() 函数中使用太多参数

Question

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

我尝试了父，根和obj来访问变量数据，但它不起作用。

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'"}]

将所有变量放入突变函数中效果很好，但这是一种丑陋的方式。我该如何处理？

Answer 1

用单个输入类型包装它们：

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()

并在突变中使用它：

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()

它还带来了以下优势：

1. 减少突变中的代码
2. 为这个突变编写请求非常容易(它将包含一个$data: UpdateEventMutationInput!变量(
3. 减少跨版本冲突，因为您不必在更改输入更改时更新请求