graphene-django 中的自定义参数

Question

如何使用 graphene-django 在 GraphQL 中创建自定义参数？

我目前在我的 schema.py 中有这个配置：

class Post(DjangoObjectType):
    class Meta:
        model = FeedPost
        interfaces = (graphene.relay.Node,)
        filter_fields = ['id']

class Query(graphene.ObjectType):
         post = graphene.Node.Field(Post)

    def resolve_post(self, info, **kwargs):
        username = kwargs.get('username')
        u = User.objects.get(username=username) 
        users_sources = FeedSource.objects.filter(user=u)
        return FeedPost.objects.filter(feed__feedsource__in=users_sources).annotate(
             source_title=F('feed__feedsource__title')
    )
schema = graphene.Schema(query=Query)

但是我一直无法弄清楚如何在“post”的实际 GraphQL 查询中使“username”成为必需的参数。

Answer 1

不确定之前是否支持，但我使用的是graphene-django>=2.15,<2.16 ，我可以确认以下语法按预期工作：

class Query(graphene.ObjectType):

    # Notice the username argument
    post = graphene.Field(Post, username=graphene.String(required=True, default=None))

    def resolve_post(self, root, info, username): # Notice: the username argument spelled exactly as before
        u = User.objects.get(username=username) 
        users_sources = FeedSource.objects.filter(user=u)
        return FeedPost.objects.filter(feed__feedsource__in=users_sources).annotate(
             source_title=F('feed__feedsource__title')
    )

GraphiQL 也正确处理它：