it should raise an error when you go to delete() it because sp2 is
not persistent; it makes no sense to call delete on it.
On Jul 21, 2006, at 8:03 PM, Brett wrote:
>
> The SA trac is down so I'll post this here so I don't forget about. I
> would expect the last line of this test to print None, instead it
> prints
> out the species name, Maxillaria test. It seems like if you set an
> attribute on an object after it has been deleted it somehow becomes
> undeleted. I haven't looked over the code in SA, is this intentional?
>
> ----------
>
> from sqlalchemy import *
> from sqlalchemy.orm.session import *
>
> uri = 'sqlite:///:memory:'
> global_connect(uri)
>
> species_table = Table('species',
> Column('id', Integer, primary_key=True),
> Column('sp', String),
> Column('genus_id', Integer, ForeignKey('genus.id')),
> Column('default_vernacular_name_id', Integer))
> # ForeignKey('vernacular_name.id')))
>
> vernacular_name_table = Table('vernacular_name',
> Column('id', Integer, primary_key=True),
> Column('name', Unicode(128),
> unique='vn_index'),
> Column('language', Unicode(128),
> unique='vn_index'),
> Column('species_id', Integer,
> ForeignKey('species.id'),
> unique='vn_index'))
>
> genus_table = Table('genus',
> Column('id', Integer, primary_key=True),
> Column('genus', String))
>
> class Genus(object):
> def __str__(self):
> return self.genus
>
> class Species(object):
> def __str__(self):
> return '%s %s' % (self.genus, self.sp)
>
> class VernacularName(object):
> def __str__(self):
> return self.name
>
> mapper(Species, species_table)
> mapper(Genus, genus_table,
> properties = {'species': relation(Species,
> backref=backref('genus', lazy=False),
> order_by=['sp'])})
> mapper(VernacularName, vernacular_name_table)
>
> default_metadata.create_all()
> genus_table.insert().execute({'genus': 'Maxillaria'})
> species_table.insert().execute({'genus_id': 1, 'sp': 'sp'})
>
> # where the action is
> session = create_session()
> sp = session.query(Species).get_by(id=1)
> assert sp is not None
> sp2 = Species()
> sp2.genus_id = 1
> session.save(sp2)
> session.delete(sp2)
> sp2.sp = 'test'
> session.flush()
> print session.query(Species).get_by(id=2)
>
> ----------
>
>
>
>
>
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