list of self-references

Hello, it might not be a real issue, but more of a question, but
here,

Line 15 in cfd6b0d

def construct_fields(model, registry, only_fields, exclude_fields):

, it is it takes care of list of self-references, but I am not understanding why it is not working for me.

I have referenced the fields parents and children with manual references (a list of ids corresponding to the '_id' field)

In Models:

class CityObject(DynamicDocument):
    _id  = StringField() 
    type = StringField()
    attributes = EmbeddedDocumentField(Attributes)
    geometry = ListField(EmbeddedDocumentField(Geometry)) 
    parents = ListField(ReferenceField('CityObject'))
    children = ListField(ReferenceField('CityObject')) 
    meta = {'collection':'CityObjects'}

In Schema:

class CityObject(MongoengineObjectType):
    class Meta: 
        model = CityObjectModel

With this code, the error is:
File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/graphene_mongo/types.py", line 205, in is_type_of raise Exception(('Received incompatible instance "{}".').format(root)) Exception: Received incompatible instance "DBRef('CityObjects', 'UUID_LOD2_011632-7908e457-f911-495e-9124')".

and when I replace 'CityObject' with 'self',
the error is:
"Cannot query field \"parents\" on type \"CityObject\"

@kjstaring : I can't reproduce your error, since following 2 cases both work:

Relay

import graphene
import json
from mongoengine import *
from graphene_mongo import (
    MongoengineObjectType,
    MongoengineConnectionField
)

connect(
    "graphene-mongo-test", host="mongomock://localhost", alias="default"
)

class CityObject(DynamicDocument):
    # _id  = StringField()
    type = StringField()
    # attributes = EmbeddedDocumentField(Attributes)
    # geometry = ListField(EmbeddedDocumentField(Geometry))
    parents = ListField(ReferenceField('CityObject'))
    children = ListField(ReferenceField('CityObject'))
    meta = {'collection':'CityObjects'}

CityObject.drop_collection()
c1 = CityObject(type='r_1')
c1.save()
c2 = CityObject(type='r_2')
c2.save()
c3 = CityObject(
    type='r_3',
    parents=[c1, c2],
    children=[c1],
)
c3.save()

query = """
    query Query {
        cites {
            edges {
                node {
                    id
                    parents {
                        edges {
                            node {
                                type
                            }
                        }
                    }
                    children {
                        edges {
                            node {
                                type
                            }
                        }
                    }
                }
            }
        }
    }
"""
schema = graphene.Schema(query=Query)
result = schema.execute(query)
print(result.errors)
print(json.dumps(result.data, indent=2))

Non-relay

import graphene
import json
from mongoengine import *
from graphene_mongo import (
    MongoengineObjectType,
    MongoengineConnectionField
)

connect(
    "graphene-mongo-test", host="mongomock://localhost", alias="default"
)

class CityObject(DynamicDocument):
    # _id  = StringField()
    type = StringField()
    # attributes = EmbeddedDocumentField(Attributes)
    # geometry = ListField(EmbeddedDocumentField(Geometry))
    parents = ListField(ReferenceField('CityObject'))
    children = ListField(ReferenceField('CityObject'))
    meta = {'collection':'CityObjects'}

CityObject.drop_collection()
c1 = CityObject(type='r_1')
c1.save()
c2 = CityObject(type='r_2')
c2.save()
c3 = CityObject(
    type='r_3',
    parents=[c1, c2],
    children=[c1],
)
c3.save()

class C(MongoengineObjectType):
    class Meta:
        model = CityObject

query = """
    query Query {
        cites {
            id
            parents {
                type
            }
            children {
                type
            }
        }
    }
"""
schema = graphene.Schema(query=Query)
result = schema.execute(query)
print(result.errors)
print(json.dumps(result.data, indent=2))

Thank you! Yes, I think that the problem is how we stored the references in the collection, namely as a string in the '_id' field. We solved it by resolving them manually.

@kjstaring : Thanks. I will close this one, and feel free to re-open it if any further issue.