On Fri, Dec 04, 2009 at 01:27:46PM -0500, Michael Bayer wrote:
>
> On Dec 4, 2009, at 1:18 PM, Alessandro Dentella wrote:
>
> >>> Is the only solution to attach an instance (u.job = myjob) or is there
> >>> another solution that doesn't require me to build the instance?
> >>
> >> if you want SQLA's delete-orphan capability, that's the only way. If you
> >> want to rely upon CASCADE rules in your DB to handle it instead, that's
> >> another way to go.
> >
> > thanks, and really... managing in the db is such a simple thing...
> >
> > Is there a why to find out the related class (that one u.job should be
> > instance of) so that I can issue a query on that?
>
>
> err, given what to start with ?
ops. Let's say starting from the class and the instance.
class Project(Base):
__tablename__ = "project"
id = Column(Integer, primary_key=True)
name = Column(String(30), nullable=False)
class Delivery(Base):
__tablename__ = 'delivery'
id = Column(Integer, primary_key=True)
project_id = Column(ForeignKey(Project.id), nullable=False)
project = orm.relation('Project', backref=orm.backref('deliveries',
cascade="all, delete-orphan", lazy=False))
sess = session()
p = Project()
d = Delivery()
d.project_id = p.id
# now I want to create automatically the instance 'p' having just
* the value 'p.id'
* d
* the name of the attribute (that is a ForeignKey) project_id
Since I need to issue:
p = sess.query(Project).get(p.id)
is there a way to get Project (the class) from d and 'project_id'
I hope now it's a little bit clearer
sandro
*:-)
--
Sandro Dentella *:-)
http://sqlkit.argolinux.org SQLkit home page - PyGTK/python/sqlalchemy
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