> rev 2233 changes some things. you no longer can make your > "primaryjoin" conditions against the polymorphic selectable (i.e. > the pjoin)...in all cases now, make the join conditions against the > base tables (i.e. the way you originally had it): > > mapper_A.add_property( 'link1', > relation( Alink == 'A' and A or B, > primaryjoin= table_A.c.link1_id==(Alink=='A' > and table_A or table_B).c.id, > foreignkey = (Alink=='A' and None or > table_A.c.link1_id), > remote_side=(Alink=='A' and table_A.c.id or > None), lazy=True, uselist=False, post_update=True ) > ) > > it also does a big explicit check/error message if you try to make > the joins against the select_table...since that was a pattern > illustrated in some examples and a few people may have things set > up that way. > > this approach is cleaner as now you never really deal with the > "polymorphic" selectable besides sending it off to your mapper, and > an entire class of errors these tests were getting go away since we > arent trying to find a foreignkey in a giant UNION anymore. the > LoaderStrategies of the relationships will "adapt" the more > rudimentary join conditions to the polymorphic selectable when they > construct the actual selection SQL. (this is SA 0.3's greater > separation of relationship definition/loader strategy definition, > while slightly more latent in performance compared to 0.2, paying > off). thanks. hmm, it gets quite tricky to follow which revision does what... any idea of adding some sqlalchemy.revision = $Rev$ or sqlalchemy.version='0.3.4' identifications? ticket 428.
i saw your ticket 423 - about topological sort - just a suggestion. i'm using gadfly's kjbuckets for that, and although i guess u don't want to rely on 3rd party library in "C", u could copy the relevant source from there (it has 100% python version too). i've used kjbuckets for many years and it's proven bulletproof. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
