On Jul 22, 2008, at 6:50 AM, Erez wrote:
>
> Hi,
> I apologize in advance if this is a newbie question, but this is
> pretty wierd and I couldn't find an answer in the docs.
>
> I have these two "tables":
>
> class Node(Base):
> __tablename__ = 'nodes'
>
> id = Column(Integer, primary_key=True)
> name = Column(String)
>
>
> class Link(Base):
> __tablename__ = 'links'
>
> node_id = Column(Integer, ForeignKey('nodes.id'))
>
> id = Column(Integer, primary_key=True)
> type = Column(String)
> fro = relation(Node, order_by=Node.id, backref="links_out")
> to = relation(Node, order_by=Node.id, backref="links_in")
>
>
> Just to clarify, I want each link to appear in the "links_out" of its
> from-node, and in the links_in of it's to-node.
>
> This works just fine when I create the classes, but once I commit the
> changes into a session, everything gets messed up (maybe the links_in
> and links_out aren't seperated as I would expect).
>
> A quick example:
>>>> sqlalchemy.__version__
> '0.5.0beta2'
>>>> cat = Node()
>>>> cat.name = "cat"
>>>> animal = grm.Node()
>>>> animal.name = "animal"
>>>> link = Link()
>>>> link.type = "is a"
>>>> link.fro = cat
>>>> link.to = animal
>>>> link
> #cat >is a> #animal
>>>> session.add(cat)
>>>> session.add(animal)
>>>> session.add(link)
>>>> session.commit()
>>>> link
> #animal >is a> #animal
you have only one foreign key to the "nodes" table, but two
relations. How can a single row in "links" maintain two separate
references to both "fro" and "to" ?
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