Cannot use a "join_to" on a SelectResults on a property of a mapper that use a polymorphic_union

[Former user]

Summary is clear I guess, but the Traceback that generates the file I will attach is even more clear.

File that will be attached is derived from the one I attached to #439

Good luck zzzeek and keep up your good work :)

[Former user]

Testing script

[Mike Bayer]

hmmm looks like im really going to have to work out having a distinct "polymorphic_primaryjoin" field on the relationships so that Query/SelectResults/etc. can make proper usage of it. this is again because i changed how the "primaryjoin" condition is determined. so this means i move the ad-hoc "aliasing" step in LazyLoader/EagerLoader into something more "official". this will be pretty good once it all works.

[Mike Bayer]

uh yeah this never worked. i have to crack open a new branch for this one, as the way relationships work has to be heavily refactored to integrate polymorphic concepts completely.

[Mike Bayer]

going to mark this as fixed as of changeset:2270 where ive checked in the relations refactoring. however more testing is needed for SelectResults/join_to/etc. specifically.