ListField(ReferenceField(x)) 查询 mongoengine

Question

我正在尝试创建一个 mongodb 数据库，下面的代码中有一些数据库文档，我正在尝试将模型分成两部分，一部分放在我放置抽象类的 common/models.py 文件中，另一部分在 monitor/models.py 上，我在其中添加了一些类方法：

common.py：

class device(DynamicDocument):
    hostname = StringField(required=True)
    management = EmbeddedDocumentField(access)
    interfaces = ListField(ReferenceField(interface))
    loopback_addr = StringField()

    meta = {'abstract': True}



class topology(DynamicDocument):
    topology_name = StringField(required=True)
    topology_desc = StringField(required=False)
    devices = ListField(ReferenceField(device))
    links = ListField(ReferenceField(link))

    meta = {'abstract' : True}

monitor.py（类方法对于这个问题并不重要）：

from mongoengine import *
from common.models import *

class device(device):

  def connect(self):
    driver = get_network_driver("ios")
    device = None
    try:
        device =  driver(self.management.management_address,self.management.username,
                        self.management.password)
        device.open()
    except Exception as e:
        print(e)
    return device


class topology(topology):

    def do_things(self)

         pass

现在，当我在创建一些实例后尝试获取拓扑的设备列表时：

mongoengine.connect("testdb",host = "0.0.0.0", port = 27017)
topology_ins = topology.objects()[0]
for dev in topology_ins.devices:
    print(dev.hostname)

我收到此错误：

Traceback (most recent call last):
 File "models.py", line 45, in <module>
 for dev in topology_ins.devices:
  File "/usr/lib/python3.7/site-packages/mongoengine/fields.py", line 852, in _get_
return super(ListField, self).__get__(instance, owner)
  File "/usr/lib/python3.7/site-packages/mongoengine/base/fields.py", line 282, in _get_
name=self.name
  File "/usr/lib/python3.7/site-packages/mongoengine/dereference.py", line 92, in _call_
self.object_map = self._fetch_objects(doc_type=doc_type)
  File "/usr/lib/python3.7/site-packages/mongoengine/dereference.py", line 174, in _fetch_objects
object_map[(collection, doc.id)] = doc
AttributeError: 'device' object has no attribute 'id

代码不分时不会出现错误

Answer 1

mongoengine 的一些内部结构依赖于模型类名称的唯一性，请尝试为具体类使用不同的名称（避免使用class device(device): 和class topology(topology):）

编辑： 我能够重现您的问题。最后，我可以通过在两个抽象类中的 meta = {'abstract': True, 'allow_inheritance': True} 中指定 allow_inheritance 来使其工作