Michael Bayer wrote:
> well, i can support this in 0.5 trunk. in rev 4965, If a descriptor
> is present on a class, or if the name is excluded via the include/
> exclude lists, the attribute will not be instrumented via the
> inherited mapper or via the mapped Table. So your example works with
> just the @property alone.
I've managed to demonstrate the issue in an isolated test (see below).
The only change from the previous is that I've set a default value.
This causes SQLAlchemy to *prefetch* the 'col' column, but this throws
an exception since the column is not mapped.
from sqlalchemy import *
from sqlalchemy.orm import *
e = create_engine('sqlite://')
m = MetaData(e)
t1= Table(
't1', m,
Column('id', Integer, primary_key=True),
Column('col', String(50), default=u""),
)
t1.create()
t2= Table(
't2', m,
Column('id', Integer, ForeignKey("t1.id"), primary_key=True),
Column('data', String(50)),
)
t2.create()
class T1(object):
pass
class T2(T1):
@property
def col(self):
return u"Some read-only value."
polymorphic = (
[T2], t1.join(t2))
mapper(T1, t1)
mapper(
T2, t2,
exclude_properties=('col',),
with_polymorphic=polymorphic,
inherits=T1,
inherit_condition=(t1.c.id==t2.c.id),
)
sess = sessionmaker()()
x = T2()
assert type(T2.col) is property
x.data = "some data"
sess.save(x)
sess.commit()
sess.clear()
assert sess.query(T2).one().data == "some data"
assert sess.query(T2).one().col == u"Some read-only value."
x = sess.query(T2).one()
x.data = "some new data"
sess.commit()
assert sess.query(T2).one().data == "some new data"
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