you've removed the "save-update" cascade which is why Specialism doesn't get
into the Session. the warning there is a new thing to give you a heads up on
that fact (I get it for the "add" message). cascade should be "all, delete,
delete-orphan" here.
On Nov 1, 2011, at 11:39 AM, Wichert Akkerman wrote:
> I am fighting a bit of an odd issue (using SQLAlchemy 0.7.3). I have an
> account class, where each account has a list of strings managed via an
> association proxy. For a reason I can't seem to find the values are not
> persisted. The test case below demonstrates this: SQLAlchemy prints a "Object
> of type <Specialism> not in session, delete operation along
> 'Account._specialism' will not proceed" error and the first assert fails.
> Strangely enough if I remove the cascade on the _specialism relationship
> adding items does work correctly, but trying to remove them fails with a
> "Dependency rule tried to blank-out primary key column
> 'specialism.account_id'" error (which is expected).
>
>
> from sqlalchemy import create_engine
> from sqlalchemy import orm
> from sqlalchemy import schema
> from sqlalchemy import types
> from sqlalchemy.ext.associationproxy import association_proxy
> from sqlalchemy.ext.declarative import declarative_base
>
>
> engine = create_engine('sqlite:///')
> metadata = schema.MetaData()
> BaseObject = declarative_base(metadata=metadata)
> Session = orm.sessionmaker(bind=engine)
>
>
> class Specialism(BaseObject):
> __tablename__ = 'specialism'
>
> account_id = schema.Column(types.Integer(),
> schema.ForeignKey('account.id',
> onupdate='CASCADE', ondelete='CASCADE'),
> primary_key=True)
> type = schema.Column(types.String(16), primary_key=True)
>
> def __init__(self, type):
> self.type = type
>
>
> class Account(BaseObject):
> __tablename__ = 'account'
>
> id = schema.Column(types.Integer(),
> schema.Sequence('account_id_seq', optional=True),
> primary_key=True, autoincrement=True)
>
> _specialism = orm.relationship(Specialism,
> cascade='delete, delete-orphan')
> #: List of :term:`specialisms<article specialism>` this account is
> #: authorized for.
> specialisms = association_proxy('_specialism', 'type')
>
>
> metadata.create_all(engine)
> session = Session()
>
> account = Account()
> session.add(account)
> account.specialisms = ['foo', 'bar']
> assert session.query(Specialism).count() == 2
> session.flush()
> account.specialisms = ['buz']
> session.flush()
> assert session.query(Specialism).count() == 1
>
>
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