无法使用graphene_django从GraphQL获取最后n个元素

我试图在现有的Django REST框架中实现GraphQL。我使用了石墨烯django==2.2.0

它已成功实施。但不能在请求查询中使用“last”关键字。我正在添加模式代码

import graphene
from graphene_django.types import DjangoObjectType
from flowers.models import Flower


class FlowerType(DjangoObjectType):
    class Meta:
        model = Flower


class Query(graphene.ObjectType):
    flowers = graphene.List(FlowerType)

    def resolve_flowers(self, info, **kwargs):
        return Flower.objects.all()

质疑

结果

{
  "errors": [
    {
      "locations": [
        {
          "column": 12,
          "line": 2
        }
      ],
      "message": "Unknown argument \"last\" on field \"flowers\" of type \"Query\"."
    }
  ]
}

---

我必须修改Django项目中的代码吗？如何解决它？

在GraphQL模式中。您需要具体说明接受最后一个参数并返回查询的查询。请指定退货类型的花（在您的情况下）

您可以将查询更改为

query($flowerId: 2) {
    flowers (last: $flowerId){
        id
    }
}

---

在GraphQL模式中。您需要具体说明接受最后一个参数并返回查询的查询。请指定退货类型的花（在您的情况下）

您可以将查询更改为

query($flowerId: 2) {
    flowers (last: $flowerId){
        id
    }
}

---

或者简单地使用继电器，它已经提供了这个过滤器，等等

class FlowerType(DjangoObjectType):
    class Meta:
        model = Flower
        interfaces = (graphene.relay.Node,)

class FlowerConnection(graphene.relay.Connection):
    class Meta:
        node = FlowerType

class Query(graphene.ObjectType):
    flowers = graphene.relay.ConnectionField(FlowerConnection)

    def resolve_flowers(self, info, **kwargs):
        return Flower.objects.all()

---

或者简单地使用继电器，它已经提供了这个过滤器，等等

class FlowerType(DjangoObjectType):
    class Meta:
        model = Flower
        interfaces = (graphene.relay.Node,)

class FlowerConnection(graphene.relay.Connection):
    class Meta:
        node = FlowerType

class Query(graphene.ObjectType):
    flowers = graphene.relay.ConnectionField(FlowerConnection)

    def resolve_flowers(self, info, **kwargs):
        return Flower.objects.all()