just FYI, the "type" column idea is taken from Hibernate, and that's
all Hibernate supports as far as polymorphic loading.
But for polymorphic loading in SA, you are free to make any kind of
"polymorphic_union" you like that can add in a functionally-generated
"type" column, and specify it into select_table. im pretty sure this
should work completely right now, such as:
import sqlalchemy.sql as sql
person_join = polymorphic_union(
{
'engineer':sql.select([people.join(engineers),
sql.column("'engineer'").label('type')]),
'manager':sql.select([people.join(managers),
sql.column("'manager'").label('type')]),
}
)
etc.
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