On Sep 28, 2010, at 3:28 PM, Mark Erbaugh wrote:
> I have a self-referential table:
>
> class L3Acct(BASE):
>
> __tablename__ = 'l3_acct'
>
> id = Column(Integer, primary_key=True)
> parent = Column(ForeignKey('l3_acct.id'))
>
> [....]
>
>
> When adding new rows to the table, the id field is not assigned a value until
> the data is actually written to the database. When adding several rows to a
> session object is there a way for a new row to reference a row that has
> previously been added in the same batch, but hasn't been assigned an id yet?
sure, you use the relation() function at the class level to associate L3Acct
instances with their parent instance, and establish the linkage at the object
level, rather than the pk/fk level.
This would be many-to-one, make sure you follow whats at
http://www.sqlalchemy.org/docs/orm/relationships.html#adjacency-list-relationships
carefully (including the remote_side flag). Those are the 0.6 docs but
configuration for 0.5.8 is the same (except relationship() is relation()).
>
> I'm using SQLAlchemy 0.5.8.
>
> Thanks,
> Mark
>
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