can't get node based off of parent node

[you-randomly]

i need to be able get a node based on it's parent type as i don't know it's child label during the call

my code is set up as such:

from neomodel import (StructuredNode, StringProperty, IntegerProperty,
    UniqueIdProperty, RelationshipTo)

class Device(StructuredNode):
        __abstract_node__ = True
        device_id = UniqueIdProperty()
        hostname = StringProperty(unique_index=True)
        vendor = StringProperty()
        ip = StringProperty()
        version = StringProperty()
        hardware = StringProperty()
        features = StringProperty()

from neo4j_device import Device

class Server(Device):
        pass

when i call

Server.nodes.first_or_none(device_id=device_id)

i get a node as expected

however when i call

Device.nodes.first_or_none(device_id=device_id)

i get the following error

raise NodeClassNotDefined(a_result_attribute[1], self._NODE_CLASS_REGISTRY)
neomodel.exceptions.NodeClassNotDefined: <exception str() failed>

i've checked in neo4j and the node can be matched on either (:Server) or (:Device)

[johnkendall]

I have the same issue. Cannot get a result with neomodel, works fine with CYPHER.

[mariusconjeaud]

Multiple node labels used to not be supported in neomodel. Can you check with the latest release 5.1.0, creating your Server class, setting __optional_labels__ to 'Device' ? As shown here in the docs.

Not sure if it fixes it but it's definitely worth a try.

[alanbuxton]

An alternative, assuming the node you require has both Device and Server labels is not to use __abstract_node__ = True

Setting abstract node True means that this class isn't used as a label in neo4j.

neomodel/neomodel/core.py

Line 611 in f4d4a72

if hasattr(scls, "__label__") and not hasattr(scls, "__abstract_node__")