Django 和 Graphene：如何处理与多态模型的双向关系？答案 |
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我有一个看起来像这样的 Django 模型（当然是简化的）： from django.db import models from polymorphic.models import PolymorphicModel class Tournament(models.Model): slug = models.CharField(max_length=100, unique=True) class Event(PolymorphicModel): tournament = models.ForeignKey(Tournament, related_name='events') slug = models.CharField(max_length=100) class PracticeEvent(Event): pass class MatchEvent(Event): winner = models.CharField(max_length=100, null=True, blank=True, default=None)锦标赛包括两种活动：练习活动和比赛。我想使用 GraphQL，使用 Graphene 来公开这个模型。这是我想出的： import graphene from graphene_django import DjangoObjectType from . import models class TournamentType(DjangoObjectType): class Meta: model = models.Tournament exclude_fields = ('id',) class EventType(graphene.Interface): tournament = graphene.Field(TournamentType, required=True) slug = graphene.String(required=True) class PracticeEventType(DjangoObjectType): class Meta: model = models.PracticeEvent interfaces = (EventType,) exclude_fields = ('id',) class MatchEventType(DjangoObjectType): class Meta: model = models.MatchEvent interfaces = (EventType,) exclude_fields = ('id',) extra_types = {PracticeEventType, MatchEventType} class Query(graphene.ObjectType): tournaments = graphene.List(TournamentType) events = graphene.List(EventType) # ... resolvers ... schema = graphene.Schema( query=Query, types=schema_joust.extra_types,)到目前为止，一切都很好；我可以直接查询events { ... }，甚至tournament也可以。但是，由于没有DjangoObjectType 和model = models.Event，我无法查询tournaments { events {...} }... 我该如何解决这个问题？我无法将EventType 设为DjangoObjectTpe，我也不知道事后添加events 字段。 |
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