thanks for the easy test. you want your IN to be against "SELECT * FROM cte" so
you need to tell it to select() from that CTE:
parent_cte = session.query(Parent).cte("parent_cte")
query = (
session.query(Child).filter(Child.parent_id.in_(parent_cte.select())).all()
)
if you just put the CTE in
from sqlalchemy import Column, ForeignKey, Integer, create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
Base = declarative_base()
class Parent(Base):
__tablename__ = 'parents'
id = Column(Integer, primary_key=True)
class
