Hi,
This is a table setup in declarative style:
class Category(DeclarativeBase):
__tablename__ = 'category'
category_id = Column(Integer, autoincrement=True,
primary_key=True)
name = Column(Unicode(255), unique=True, nullable=False)
children = relation('Category', backref=backref('parent',
remote_side=[category_id]))
When creating the database, this is the error I see:
sqlalchemy.exc.ArgumentError: Could not determine join condition
between parent/child tables on relation Category.children. Specify a
'primaryjoin' expression. If this is a many-to-many relation,
'secondaryjoin' is needed as well.
I suppose I could follow the examples and setup a separate mapper for
the self referential part, but I'd like to know how to do it in the
declarative style.
Thanks,
Kees
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