django - 如何在嵌套序列化程序中使用 mongoengine 为 Django-Rest-Framework 定义正确的 .create() 方法

Question

我正在发送一个 API 发布请求，请求正文中包含以下内容，以将其序列化为 EventSerializer 文档，而所有者则作为嵌入式文档列表持久保存：

{
 "name": "string",
 "name_english": "string",
 "starts_on": "2020-05-21T18:46:05.049Z",
 "ends_on": "2020-05-21T18:46:05.049Z",
 "local": "string",
 "description": "string",
 "owners": [
    {
      "first_name": "string",
      "last_name": "string",
      "email": "user@example.com",
      "id": "5ec6dd64d581f76fbfad60eb"
    }
  ]
}

模型.py：

class UserRef(EmbeddedDocument):

  id = fields.ReferenceField(User, required=True)
  first_name = fields.StringField(max_length=255, required=True)
  last_name = fields.StringField(max_length=255, required=True)
  email = fields.EmailField(max_length=255, required=True)

class Event(Document):

  name = fields.StringField(max_length=255, required=True)
  name_english = fields.StringField(max_length=255, required=True)
  starts_on = fields.DateTimeField(required=True)
  ends_on = fields.DateTimeField(required=True)
  local = fields.StringField(max_length=255, required=True)
  description = fields.StringField(max_length=255, required=True)
  owners = fields.EmbeddedDocumentListField(UserRef, required=False)

序列化程序.py：

class UserRefSerializer(serializers.EmbeddedDocumentSerializer):
  class Meta:
      model = UserRef

class EventSerializer(serializers.DocumentSerializer):
  owners = UserRefSerializer(many=True)

  class Meta:
      ref_name = "Event"
      model = Event
      fields = ["id", "name", "name_english", "starts_on", "ends_on", "local", "description", "owners"]

  def create(self, validated_data):
      owners_data = validated_data.pop("owners")
      event = Event.objects.create(**validated_data)
      event.owners = []

      for owner_data in owners_data:
          event.owners.append(owner_data)

      event.save()
      return event

视图.py：

class EventViewSet(viewsets.ModelViewSet):
  queryset = Event.objects.all()
  serializer_class = EventSerializer

当我运行 post 请求时，Event 对象确实被持久化了；但是，所有者列表（嵌入文档的列表）不会保留在事件中。它只是设置为一个空白列表 [ ]。我在这里做错了什么？

Answer 1

您必须在 for 中实例化所有者模型。尝试这个：

def create(self, validated_data):
  owners_data = validated_data.pop("owners")
  event = Event.objects.create(**validated_data)
  event.owners = []

  for owner_data in owners_data:
      event.owners.append(UserRef(**owner_data))

  event.save()
  return event