> taking a look, i think what you should do is use an alias of the > table_Employee in your queries. since the engineer mapper is using > joined table inheritance, the default table_Employee is already > going to be involved in the query, so your external join condition > needs to be off a distinct alias of it to prevent mixups. ok, aliasing table_employee (the base of Engineer) everywhere works.
Then another question. The (2) is a sort of hand-made, (3,4) are "programatical". The queries they produce are quite different - (2) joins .helper against tableEmployee while the other two join it against the whole polymorphic_union - which isn't needed (ehm, thats 2 pages sql for 10 classes). Is there a way to hint these not to do it, e.g. some mapper/query option or specify different mapper or something? i will probably generate clauses using (2) anyway, but just in case i want to have a door open... > On Feb 13, 11:17 am, svilen <[EMAIL PROTECTED]> wrote: > > hi. > > > > Here is a simple case which does not work - or i cannot figure > > out how to make it work. > > 'give all engineers which have helper employee of age >=20'; > > where Engineer inherits Employee via table-inheritance. > > > > i've tried multiple ways to achieve the result - neither works, > > in different ways. > > > > Some give empty result (2 & 3). IMO in these the FROM is missing > > a second table. > > > > (4) raises Exception about some column missing - but only if > > neither of other ways is tried before it; if some of the other > > ways is tried, this one does not raise and returns a result. > > > > (1) is for reference only; > > > > bye > > > > t-query.py > > 3KDownload > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
