Re: [SQLObject] Inheritance strangeness

[michelts <mic...@gm...>]

For now I use the following syntax:

  Employee.select(Person.q.name =3D=3D 'some name')

The column name is originally from Person...

regards,


On 6/3/05, Oleg Broytmann <ph...@ph...> wrote:
> On Fri, Jun 03, 2005 at 07:05:50PM +1000, ab...@ne... wrote:
> > class Employee(Person):
> >     _connection =3D conn
> >     _inheritable =3D False                     # comment this line to s=
olve bug OR
> >     #position =3D StringCol(default=3D'Chief')   # uncomment this line =
to solve bug
>=20
>    I've found the cause of the problem. Inheritance machinery does not
> like classes that don't have attributes (beside obvious id). The
> machinery needs to propagate columns from an every parent class to all
> its children, but in a class with no attributes the code is not
> triggered!
>    I'll look further if I can trigger the code somewhere else. Meanwhile
> you've found two ways to overcome the problem. Either add a fake column
> or a StringCol("childName") via setting _inheritable =3D True.
>=20
> > in my situation not all
> > my inherited classes define extra attributes (e.g. they instead have
> > different behaviour etc.)
>=20
>    PS. I wonder how do they have different behavior without any
> attributes? Via properties, I suppose?
>=20
> Oleg.
> --
>      Oleg Broytmann            http://phd.pp.ru/            ph...@ph...
>            Programmers don't die, they just GOSUB without RETURN.
>=20
>=20
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>=20


--=20
Michel Thadeu Sabchuk
Curitiba - Brasil