Mike, thanks a lot. Big help. I'm almost there.
This seems to do the trick:
usersid = Column(Integer, primary_key=True, key='id')
inviter_id = Column(Integer, ForeignKey('users.id'))
inviter = relationship('User',
uselist = False,
backref = backref('invitee', remote_side=usersid, uselist=True),
)
When there are two users, one being the inviter (parent) and the other being
the invitee (child), it works like a charm:
self.assertEqual(invitee1.inviter.id, inviter.id)
self.assertEqual(inviter.invitee[0].id, invitee1.id)
But add a third user, one being the inviter and two being the invitees,
invitee1.inviter is None.
Any ideas for me?
On Tue, Feb 22, 2011 at 7:54 AM, Michael Bayer <mike...@zzzcomputing.com>wrote:
>
> On Feb 20, 2011, at 10:12 PM, Ryan wrote:
>
> I'm attempting a self-referential mapping on a Client object that includes
> these two columns:
>
> id = Column(Integer, primary_key=True)
> inviter_id = Column(Integer, ForeignKey('users.id'), nullable=True)
>
>
> Started here with no luck:
>
> inviter = relationship('Client', primaryjoin='Client.id ==
> Client.inviter_id', uselist=False)
>
>
> Then read about self-referential mapping in the docs and tried with no
> luck:
>
> inviter = relationship('Client', remote_side='Client.id', uselist=False)
>
>
> And this with an error:
>
> relationship('Client', remote_side=[Client.id], uselist=False)
>
>
> Would be a great help to see how this is done in a declarative style.
> Thanks!
>
>
>
> the last example in the section
> http://www.sqlalchemy.org/docs/orm/relationships.html#adjacency-list-relationshipsillustrates
> a declarative self-referential relationship. Note that the "id"
> Column object can be referenced directly when you're inside the class
> declaration itself.
>
>
>
>
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