Does session management only work with explicit relation and backref
declarations on a mapper?
Given the declarations at the bottom of this note, I've tried this:
s = get_session() # returns session
p = picker(name=bkc)
s.save(p)
s.flush()
o = order(ordernumber='xyz')
s.save(o)
s.flush()
p.orders # returns []
p.orders.append(o)
s.flush()
p.orders # returns [order(xyz)]
p.orders.remove(o)
s.flush()
p.orders # returns []
o.picker = p.id
s.flush() # does proper sql update to set picker id on order table ok
p.orders # returns [] but I expect it to return the order
I'm going to use backref to work around this, I bet that will resolve the
problem, but I'm curious why the mapper doesn't discover foreignkeys
itself and watch for direct manipulation..
---------
metadata = MetaData(name='meta')
Tpicker = Table('pickers', metadata,
Column('id', Integer, Sequence('pid'), primary_key=True,
nullable = False),
Column('name', String(32), nullable=False, unique=True),
)
Torder = Table('orders', metadata,
Column('id', Integer, Sequence('oid'), primary_key=True,
nullable = False),
Column('ordernumber', String(8), nullable=False, unique=True),
Column('priority', Integer),
Column('picker', Integer, ForeignKey(Tpicker.c.id)),
)
class auto_attr(object):
def __init__(self, **kw):
for k, v in kw.items():
setattr(self, k, v)
class picker(auto_attr):
pass
class order(auto_attr):
pass
mapper(picker, Tpicker, properties={
'orders': relation(order),
})
mapper(order, Torder)
--
Brad Clements, [EMAIL PROTECTED] (315)268-1000
http://www.murkworks.com
AOL-IM or SKYPE: BKClements
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