try :
m = mapper(MyJoin, a_table.join(b_table), properties={
'a_id' : [Table_a.__table__.c.id, Table_b.__table__.c.a_id]
})
from:
http://www.sqlalchemy.org/docs/05/mappers.html#mapping-a-class-against-multiple-tables
On May 5, 11:46 am, Alessandro Dentella <[email protected]> wrote:
> Hi,
>
> how should I configure a mapper that represents a join between two tables
> so that inserting a new object writes the foreign key between the two in
> the proper way?
>
> class Table_a(Base):
> __tablename__ = 'a'
> id = Column(Integer, primary_key=True)
> description = Column(String(100))
>
> class Table_b(Base):
> __tablename__ = 'b'
>
> idb = Column(Integer, primary_key=True)
> a_id = Column(ForeignKey(Table_a.id), nullable=False)
>
> a_table = Table_a.__table__
> b_table = Table_b.__table__
>
> class MyJoin(object): pass
>
> m = mapper(MyJoin, a_table.join(b_table))
>
> j = MyJoin()
> j.description = 'xxx'
>
> sess.add(j)
>
> Base.metadata.bind.echo = True
> sess.commit()
>
> 2009-05-05 12:41:52,346 INFO sqlalchemy.engine.base.Engine.0x...7acL BEGIN
> 2009-05-05 12:41:52,347 INFO sqlalchemy.engine.base.Engine.0x...7acL INSERT
> INTO a (description) VALUES (?)
> 2009-05-05 12:41:52,347 INFO sqlalchemy.engine.base.Engine.0x...7acL ['xxx']
> 2009-05-05 12:41:52,348 INFO sqlalchemy.engine.base.Engine.0x...7acL INSERT
> INTO b (a_id) VALUES (?)
> 2009-05-05 12:41:52,348 INFO sqlalchemy.engine.base.Engine.0x...7acL [None]
> 2009-05-05 12:41:52,348 INFO sqlalchemy.engine.base.Engine.0x...7acL ROLLBACK
>
> Is it possible to prepare the mapper so that a_id gets the value that
> the first object got as id?
>
> thanks
> sandro
> *:-)
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