Adrian von Bidder wrote:
> Heyho!
>
> How can I use Declarative to create self-referencing stuff? I'm trying
> without success to create the tree example (Node with Node.parent and
> Node.children) in declarative.
>
> The basic table is:
>
> class Node(Base):
> __tablename__ = 'nodes'
>
> id = Column(Integer, primary_key = True)
> parent_id = Column('parent', Integer, ForeignKey('nodes.id'))
>
> Now I'm struggling with how to add a relation so that I can use
> mynode.parent and mynode.children.
>
> I've tried
> parent = relation(
> 'Node', backref=backref('children', remote_side=[Node.id]))
> and various variants but always ended up with an exception (different ones
> for various cases.)
>
> I guess I have to use remote_side somehow but I couldn't figure how.
class Node(Base):
__tablename__ = 'nodes'
id = Column(Integer, primary_key = True)
parent_id = Column('parent', Integer, ForeignKey('nodes.id'))
parent = relation("Node", remote_side=id, backref="children")
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