Gloria W wrote:
> Hi all,
> I am trying to use the session syntax to bind to an existing table,
> but I am apparently missing something. I want my session to be bound
> to this:
>
> my_table = sqlalchemy.Table('my_table', meta, autoload=True,
> autoload_with=engine)
>
> and if I use the same engine here:
>
> session = sqlalchemy.orm.sessionmaker(bind=engine, autoflush=True,
> transactional=True)
>
> isn't the session bound to the table?
>
> But when I run this:
>
> all_records = session.query(my_table).all()
>
> I get this error:
>
> Traceback (most recent call last):
>[..zip...[
> AttributeError: 'PGCompiler' object has no attribute 'mapped_table'
>
> The docs I've seen only show session bindings using Table classes, so
> please point me to a good example or give me the quick hint.
The ORM maps your Python classes to tables rather than working with
tables directly. You're missing a step in the middle like:
class MyClass(object):
def my_stuff(self):
self.yadayada
sqlalchemy.orm.mapper(MyClass, my_table)
all_records = session.query(MyClass).all()
The ORM tutorial lays out the steps in more detail:
http://www.sqlalchemy.org/docs/04/ormtutorial.html
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