AttributeError while querying: Neither 'InstrumentedAttribute' object nor 'Comparator' has an attribute

Question

The following code:

Base = declarative_base()
engine = create_engine(r\"sqlite:///\" + r\"d:\\foo.db\",
                       listeners=[ForeignKeysListener()])         


        

Answer 1

I cannot explain technically what happens but you can work around this problem by using:

ses.query(FooBar).join(Foobar.bar).join(Bar.foo).filter(Foo.name == "blah")