Question

在GraphQL更新中，我希望能够传递子对象的值，但我希望每个值都是可选的。

所以我创建了一个像这样的输入类：

class CityCouncilInput(graphene.InputObjectType):
  mayor = graphene.String()
  treasurer = graphene.String()

现在，我希望能够传递市长和掌柜的价值，或只传递其中一个。

请知道，如果传入了所有值，我的代码就可以正常运行。我只想让这些字段值可选。我该怎么做？

罗伯特

Answer 1

你可以尝试

class CityCouncilInput(graphene.InputObjectType):
  mayor = graphene.String(required=False, default=None)
  treasurer = graphene.String(required=False, default=None)

Answer 2

我认为最简单的方法是为变异函数定义默认参数

假设您使用以下模型，则您的值可以为空白（注意：我假设mayor和treasurer都可以为空白，但不允许{{ 1}}-否则我想您可以将NULL作为默认参数）：

None

然后创建市议会，这应该起作用：

class CityCouncil(models.Model):
    mayor = models.TextField(max_length=1000, blank=True)
    treasurer = models.CharField(max_length=1000, blank=True)

类似地，执行更新突变时，您可以传入可选参数，并使用class createCityCouncil(graphene.Mutation): mayor = graphene.String() treasurer = graphene.String() class Arguments: mayor = graphene.String() treasurer = graphene.String() def mutate(self, mayor="", treasurer=""): council = CityCouncil(mayor=mayor, treasurer=treasurer) council.save() return createCityCouncil( mayor=council.mayor, treasurer=council.treasurer )有选择地更新对象的属性。

setattr

Answer 3

您可能只需要在mutate函数中运行if语句即可具有更新任何一个字段的能力，并且类updateCityCouncil的代码如下（PS：请注意名为CityCouncil和GraphQL的模型的假设型号）

    class CityCouncilType(DjangoObjectType):
        class Meta:
            model = CityCouncil

    class CityCouncilInput(graphene.InputObjectType):
        id = graphene.Int()
        mayor = graphene.String()
        treasurer = graphene.String()

    class updateCityCouncil(graphene.Mutation):
        class Arguments:
            id = graphene.Int(required=True)
            input = CityCouncilInput(required=True)

        ok = graphene.Boolean()
        council = graphene.Field(CityCouncilType)

        @staticmethod
        def mutate(root, info, id, input=None):
            ok = False
            this_council = CityCouncil.objects.get(pk=id)
            if this_council:
                ok = True
                if input.mayor is not None:
                    this_council.mayor = input.mayor
                if input.treasurer is not None:
                    this_council.treasurer = input.treasurer
                this_council.save()
                return updateCityCouncil(ok=ok, council=this_council)
            return updateCityCouncil(ok=ok, council=None)

如何使Graphene输入类变量可选？

3 个答案: