also, I wonder how the way you were doing it before, with composite,
was actually working out ? It wasn't intended to hold "half" of a
primary key like that which is probably why I warned against it, but
if its working for you, there's no reason not to use it.
I.e. with declarative just put the Column objects inside the composite:
class User(Base):
__tablename__ = 'user'
house_address_id = Column('house_address', Integer,
ForeignKey('address.id'))
office_address_id = Column('office_address', Integer,
ForeignKey('address.id'))
house_address = relation(Address,
primaryjoin=house_address_id==Address.id)
office_address = relation(Address,
primaryjoin=office_address_id==Address.id)
comp = composite(Comp, Column('id', Integer, primary_key=True,
autoincrement=True), Column('name', CHAR))
On Nov 4, 2008, at 7:29 PM, Ritesh Nadhani wrote:
> Unfortunately, it still gives me an error.
>
> http://paste.pocoo.org/show/90191
>
> Did I miss something?
>
> PS: I added the __get__ method just for the fun of it, I have no
> idea what it does. Looking at the docs:
> http://www.sqlalchemy.org/docs/04/sqlalchemy_orm_interfaces.html#docstrings_sqlalchemy.orm.interfaces_PropComparator
>
> , seems that I have to implement other methods but I am not sure
> which one.
>
> Any help is appreciated.
>
> On Mon, Oct 27, 2008 at 7:45 AM, Michael Bayer <[EMAIL PROTECTED]
> > wrote:
>
> theres a "bug" in that the error message is misleading, but in fact a
> composite property owns the columns within it which cannot be mapped
> separately, so to make that "work" you'd need to say:
>
> class User(Base):
>
> __tablename__ = 'user'
>
> house_address_id = Column('house_address', Integer,
> ForeignKey('address.id'))
> office_address_id = Column('office_address', Integer,
> ForeignKey('address.id'))
> house_address = relation(Address,
> primaryjoin=house_address_id==Address.id)
> office_address = relation(Address,
> primaryjoin=office_address_id==Address.id)
> comp = composite(Comp, Column('id', Integer, primary_key=True,
> autoincrement=True), Column('name', CHAR))
>
> but the way you're using Comp isn't going to work in any case; you're
> actually looking for comparable_property() here:
>
> class MyComparator(sqlalchemy.orm.interfaces.PropComparator):
> def __eq__(self, other):
> return self.comp == other.comp
>
> class User(Base):
>
> __tablename__ = 'user'
>
> id = Column('id', Integer, primary_key=True, autoincrement=True)
> name = Column('name', CHAR)
> house_address_id = Column('house_address', Integer,
> ForeignKey('address.id'))
> office_address_id = Column('office_address', Integer,
> ForeignKey('address.id'))
> house_address = relation(Address,
> primaryjoin=house_address_id==Address.id)
> office_address = relation(Address,
> primaryjoin=office_address_id==Address.id)
>
> @property
> def comp(self):
> return self.id + self.name
>
> comp = comparable_property(MyComparator)
>
>
> On Oct 27, 2008, at 9:22 AM, riteshn wrote:
>
> >
> > Hello all
> >
> > New to SQLAlchemy and ORM and loving it. I am trying to use the
> > declarative base extension with composite column.
> >
> > I have two very simple tables - user and address.
> >
> > My code at: http://python.pastebin.com/m6e032164 works without any
> > problem.
> >
> > I am trying to put the same thing using declarative base:
> > http://python.pastebin.com/m1a05e5c0 and it throws me the error.
> >
> > Any ideas?
> >
> > >
>
>
>
>
>
>
> --
> Ritesh
> http://www.riteshn.com
>
> >
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