Hi,
I need to implement the storage of the neighborood of a place. I try to
use Declarative and relation to get this done but it sounds like I
missed something important I can not understand.
Here are my models:
neighbors_table = Table('neighbors', Base.metadata,
Column('shop_id', Integer, ForeignKey('places.id'), primary_key=True),
Column('neighbor_id', Integer, ForeignKey('places.id')),
)
class Place(Base):
__tablename__ = 'places'
name = Column(Unicode(255), nullable=True)
neighbors = relation('Place', secondary=neighbors_table)
But as soon as I try to use a Place object, I get this error:
sqlalchemy.exc.ArgumentError: Could not determine join condition between
parent/child tables on relation Shop.neighbours. Specify a
'primaryjoin' expression. If this is a many-to-many relation,
'secondaryjoin' is needed as well.
I tried to add a primaryjoin and a secondaryjoin but with no success.
Sounds like I don't understand what are primaryjoin and a secondaryjoin
expressions.
Any idea ?
Regards,
Laurent
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