Django Rest Framework，多对多组

Question

我是使用 DRF 的新手。我有一个 2 层的多对多关系，我希望能够提供服务。

# models.py
class Person(models.Model):
    name = models.CharField(max_length=32)
class Group (models.Model):
    name = models.CharField(max_length=32)
    people = models.ManyToManyField(Person,related_name='groups',blank=True)
class Event(models.Model):
    name = models.CharField(max_length=32)
    groups = models.ManyToManyField(Group,related_name='events',blank=True)

在我的序列化程序中，我希望能够在 Person 中显示他们正在参加的活动。

class PersonSerializer(serializers.ModelSerializer):
    groups = serializers.StringRelatedField(many=True)
    #not sure how to lookup the events related field here...
    events = EventSerializer(source='groups.name', many=True,read_only=True)

    class Meta:
        model = Person
        fields = ('name', 'events')

但是，我在查找事件时遇到了错误。这种查找甚至可能吗？

目前的输出如下所示：

{
    "id": 1,
    "name": "mike",
    "groups": [
        "dev"
    ],
    "events": null
}

我希望输出是事件列表。

Answer 1

我不知道这是否有效，

class EventSerializer(serializers.ModelSerializer):

    class Meta:
        Model = Event
        fields = ('name')

class GroupSerializer(serializers.ModelSerializer):
    events = EventSerializer(many=True, read_only=True)
    class Meta:
        model = Group
        fields = ('name', 'events')

然后，更新 PersonSerializer，

class PersonSerializer(serializers.ModelSerializer):
    groups = GroupSerializer(many=True, read_only=True)
    class Meta:
        model = Person
        fields = ('name', 'groups')