Hi,
As you are defining Country when you use it within your relation, you
need to define your relation like this :
parent = relation("Country", backref=backref('child'), cascade="all")
Note the quotes around Country.
Regards,
Laurent
Cedric a écrit :
> Hi,
>
> I'm trying to migrate my TurboGears project from SQLObject to
> SQLAlchemy. As the TurboGears2 way of using SQLAlchemy is the
> DeclarativeBase, I'm trying to achive a self-referential using the
> DeclarativeBase. Following the documentation, it seems that the
> following code "could" be correct (after a translation from the Base
> example), but in fact, it complains that the "Country" name is not
> defined...
>
> File "/is2dev/dev/model/model.py", line 47, in Country parent =
> relation(Country, backref=backref('child'), cascade="all")
> NameError: name 'Country' is not defined
>
> I just try to make a tree with the world > continents > regions >
> countries.
>
> class Country(DeclarativeBase):
> """
> Country with iso and related region
> """
> __tablename__ = 'countries'
>
> #{ Columns
> id = Column(Integer, primary_key=True)
> name = Column(Unicode(100), nullable=False)
> iso = Column(Unicode(3), nullable=False)
> created = Column(DateTime(), default=datetime.now(),
> nullable=False)
> updated = Column(DateTime(), nullable=True)
> #{ Relations
> parent_id = Column(Integer, ForeignKey('countries.id'),
> nullable=True)
> parent = relation(Country, backref=backref('child'),
> cascade="all")
> #{ Special methods
>
> #}
>
> Thanks for your help...
> Regards
> Cédric
>
> >
>
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