用于外键的Django Graphene查询过滤

# models.py
from django.db import models

class Author(models.Model):
    name = models.CharField(max_length=100)

class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.ForeignKey(Author, on_delete=models.CASCADE)

# schema.py
import graphene
from graphene_django.types import DjangoObjectType
from .models import Author, Book

class AuthorType(DjangoObjectType):
    class Meta:
        model = Author

class BookType(DjangoObjectType):
    class Meta:
        model = Book

class Query(graphene.ObjectType):
    books_by_author = graphene.List(BookType, author_id=graphene.Int())

    def resolve_books_by_author(self, info, author_id):
        return Book.objects.filter(author_id=author_id)

schema = graphene.Schema(query=Query)

# 示例查询
query {
  booksByAuthor(authorId: 1) {
    title
    author {
      name
    }
  }
}

# 确保类型定义正确
class BookType(DjangoObjectType):
    class Meta:
        model = Book
        fields = ("title", "author")