On Feb 7, 2:06 am, Werner Thie <[EMAIL PROTECTED]> wrote:
>
> No problem to define a one to many relation from AAA > BBB so far.
> Now, as it always goes with 'legacy', some clever guy added another
> table, again with a one to many relation from AAA > CCC with a catch:
>
> ccc = Table( 'CCC',
> metadata,
> Column('pk4', String(6), primary_key=True),
> Column('pk3', Integer, primary_key=True))
>
> where pk4 is the concatenation of pk1 and pk2.
>
I'm not a database/sql expert, but I don't think its possible
(certainly never heard of it) to map 2 distinct columns to a single
concatenation of a those 2 columns. As far as the database is
concerned they're completely different. If possible, split the
columns up in that table (hopefully there aren't too many records?).
If its not (yay legacy), perhaps creating an intersection table from
AAA -> CCC: A_to_C(pk1_fk, pk2_fk, pk4_fk); that might give you enough
leeway to accomplish what you want. I don't know enough about
sqlalchemy to say if it can or can't.
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