在graphene-django中创建自定义对象以返回分组计数

from django.db import models

class Category(models.Model):
    name = models.CharField(max_length=255)

    def __str__(self):
        return self.name

import graphene
from graphene_django import DjangoObjectType
from django.db.models import Count

from .models import Category

class CategoryType(DjangoObjectType):
    class Meta:
        model = Category
        fields = ("id", "name", "count")

    count = graphene.Int()

    def resolve_count(self, info):
        return self.products.count()

class Query(graphene.ObjectType):
    categories = graphene.List(CategoryType)

    def resolve_categories(self, info):
        return Category.objects.annotate(count=Count("products"))

schema = graphene.Schema(query=Query)

from django.urls import path
from graphene_django.views import GraphQLView

urlpatterns = [
    path("graphql/", GraphQLView.as_view(graphiql=True)),
]

query {
  categories {
    id
    name
    count
  }
}