On Aug 13, 2:37 pm, Anton Gritsay <gene...@angri.ru> wrote:
> Hi, Allen!
>
> You can use something like this (yeah, I know that it isn't
> declarative in any way):
>
> class Node(Base):
> __tablename__ = 'node'
> id = Column(Integer, primary_key=True)
> parent_id = Column(ForeignKey('node.id'))
>
> parent = relation("Node", remote_side=[id])
>
> mp_path = Column(sqlamp.PathField())
> mp_depth = Column(sqlamp.DepthField())
> mp_tree_id = Column(sqlamp.TreeIdField())
>
> Node.mp = sqlamp.MPManager(
> Node.__table__,
> pk_field='id',
> parent_id_field='parent_id',
> path_field_name='mp_path',
> depth_field_name='mp_depth',
> tree_id_field_name='mp_tree_id'
> )
> Node.__mapper__.extension.append(Node.mp.mapper_extension)
>
> Note that you need to define mp_* colums. You doesn't need it if you
> create MPManager *before* creating mapper.
>
Anton,
Thank you for the help. And the excellent library. :)
I will try this code out as soon as I can.
Michael B:
Is this the only way to register such an extension with declarative
base? Can a simpler method be devised?
-- AF
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