Here, no need to touch Property.get_join(), only a new join_via():
def join_via( keys, mapper):
clause = None
c = None
self_select_table = None
for key in keys:
prop = mapper.props[key]
try:
c = prop.get_join() #SA rev<2285
except TypeError:
c = prop.get_join( mapper) #SA rev>=2285
if prop.mapper is mapper:
column_equivalents =
mapper._get_inherited_column_equivalents()
parent_select_table = self_select_table
self_select_table = prop.target.alias()
c.accept_visitor( sqlalchemy.sql_util.ClauseAdapter(
self_select_table,
include=prop.remote_side,
equivalents= column_equivalents
))
if parent_select_table:
c.accept_visitor( sqlalchemy.sql_util.ClauseAdapter(
parent_select_table,
include=prop.foreignkey,
equivalents= column_equivalents
))
if clause is None:
clause = c
else:
clause &= c
mapper = prop.mapper
return clause, mapper, lasttable
### now and_() the condition_column._makeproxy( lasttable) and above
clause. hmm that should be another ClauseAdapter...
> no, wrong, there's more to it; each level's parent.table should be
> the previous level's aliased table...
>
> > i think i managed to construct a proper thing, changing
> > PropertyLoader.get_join(), and made my own join_via():
>
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