NoneType related warnings / errors when using schema.execute()

[GeoffreyY]

In some cases when calling a query directly with schema.execute(query_string), I'll get some warning / error message about NoneType. However, when using a flask app instead, I don't receive any error messages on the server side nor the client side.

Full test case

from sqlalchemy import create_engine, Table, Column, Integer, String, ForeignKey
from sqlalchemy.orm import scoped_session, sessionmaker, relationship, backref
from sqlalchemy.ext.declarative import declarative_base

engine = create_engine("sqlite:///:memory:", echo=True)
db_session = scoped_session(sessionmaker(autocommit=False, autoflush=False, bind=engine))
Base = declarative_base()
Base.query = db_session.query_property()

class Song(Base):
    __tablename__ = 'songs'
    song_id = Column(Integer, primary_key=True)
    name = Column(String, nullable=False)
    tags = relationship('Tag',
                        secondary='song_tag_table',
                        backref='songs')

class Tag(Base):
    __tablename__ = 'tags'
    tag_id = Column(Integer, primary_key=True)
    name = Column(String)

class SongTagTable(Base):
    __tablename__ = 'song_tag_table'
    id = Column(Integer, primary_key=True)
    song_id = Column(Integer, ForeignKey('songs.song_id'))
    tag_id = Column(Integer, ForeignKey('tags.tag_id'))

Base.metadata.create_all(engine)

# ==========

from graphene import ObjectType, Schema
from graphene.relay import Connection, Node
from graphene_sqlalchemy import SQLAlchemyObjectType
from graphene_sqlalchemy_filter import FilterableConnectionField, FilterSet

class SongFilter(FilterSet):
    class Meta:
        model = Song
        fields = {'song_id': ['eq', 'ne', 'in']}

class TagFilter(FilterSet):
    class Meta:
        model = Tag
        fields = {'tag_id': ['eq', 'ne', 'in']}

class CustomField(FilterableConnectionField):
    filters = {
        Song: SongFilter(),
        Tag: TagFilter()
    }

class SongNode(SQLAlchemyObjectType):
    class Meta:
        model = Song
        interfaces = (Node,)
        connection_field_factory = CustomField.factory

class TagNode(SQLAlchemyObjectType):
    class Meta:
        model = Tag
        interfaces = (Node,)
        connection_field_factory = CustomField.factory

class SongConnection(Connection):
    class Meta:
        node = SongNode

class TagConnection(Connection):
    class Meta:
        node = TagNode

class Query(ObjectType):
    all_songs = CustomField(SongConnection)
    all_tags = CustomField(TagConnection)

schema = Schema(query=Query)

# ==========

jpop = Tag(name='jpop')

subarashi = Song(name='素晴らしい日々')
subarashi.tags.append(jpop)
db_session.add(subarashi)

fool_in_tank = Song(name='水槽のフール')
fool_in_tank.tags.append(jpop)
db_session.add(fool_in_tank)

despacito = Song(name='despacito')
db_session.add(despacito)
db_session.commit()

# ==========

query_string = """
insert test query here
"""
res = schema.execute(query_string)
print(res)

Normal test case, no errors

query_string = """
query {
  allSongs {
    edges {
      node {
        name
      }
    }
  }
}
"""

response (normal):

{'data': {'allSongs': {'edges': [{'node': {'name': '素晴らしい日々'}}, {'node': {'name': '水槽のフール'}}, {'node': {'name': 'despacito'}}]}}}

Testing filtering, runtime warning

query_string = """
query {
  allSongs(filters: {songIdNe: 2}) {
    edges {
      node {
        name
      }
    }
  }
}
"""

response (normal):

{'data': {'allSongs': {'edges': [{'node': {'name': '素晴らしい日々'}}, {'node': {'name': 'despacito'}}]}}}

warning:

c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\filters.py:750: RuntimeWarning: Graphene-SQLAlchemy-Filter: info.context has an unsupported type <class 'NoneType'>. Now cls.aliased(info, ...) is not supported. Allowed types: dict and object with __dict__ attribute.
  warnings.warn(msg, RuntimeWarning)

Large error

query_string = """
query {
  allSongs {
    edges {
      node {
        name
        tags {
          edges {
            node {
              name
            }
          }
        }
      }
    }
  }
}
"""

response:

{'errors': [{'message': "'NoneType' object has no attribute '_sqla_filter_dataloaders'", 'locations': [{'line': 7, 'column': 9}], 'path': ['allSongs', 'edges', 0, 'node', 'tags']}, {'message': "'NoneType' object has no attribute '_sqla_filter_dataloaders'", 'locations': [{'line': 7, 'column': 9}], 'path': ['allSongs', 'edges', 1, 'node', 'tags']}, {'message': "'NoneType' object has no attribute '_sqla_filter_dataloaders'", 'locations': [{'line': 7, 'column': 9}], 'path': ['allSongs', 'edges', 2, 'node', 'tags']}], 'data': {'allSongs': {'edges': [{'node': {'name': '素晴らしい日々', 'tags': None}}, {'node': {'name': '水槽のフール', 'tags': None}}, {'node': {'name': 'despacito', 'tags': None}}]}}}

error:

An error occurred while resolving field SongNode.tags
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
AttributeError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
graphql.error.located_error.GraphQLLocatedError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'

An error occurred while resolving field SongNode.tags
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
AttributeError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
graphql.error.located_error.GraphQLLocatedError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'

An error occurred while resolving field SongNode.tags
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
AttributeError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'
Traceback (most recent call last):
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executor.py", line 452, in resolve_or_error
    return executor.execute(resolve_fn, source, info, **args)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphql\execution\executors\sync.py", line 16, in execute
    return fn(*args, **kwargs)
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 356, in connection_resolver
    data_loader: ModelLoader = cls._get_or_create_data_loader(
  File "c:\users\geoffrey\appdata\local\programs\python\python38\lib\site-packages\graphene_sqlalchemy_filter\connection_field.py", line 318, in _get_or_create_data_loader
    setattr(info.context, cls.dataloaders_field, data_loaders)
graphql.error.located_error.GraphQLLocatedError: 'NoneType' object has no attribute '_sqla_filter_dataloaders'

library versions:

python: 3.8.0
sqlalchemy: 1.3.20
graphene: 2.1.8
graphene_sqlalchemy: 2.3.0
graphene_sqlalchemy_filter: 1.12.1

I'm new to both sqlalchemy and graphql, so hopefully I didn't make any trivial mistakes. Thanks!

[kushalmittal]

@GeoffreyY I am facing the same error. Were you able to resolve it?
@art1415926535 is this something that is known?

[art1415926535]

Hi. Request requires context with session

graphene-sqlalchemy-filter/tests/test_integration.py

Lines 122 to 124 in 05e58de

	execution_result = schema.execute(
	request_string, context={'session': session}
	)