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?
>
> >
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