I'm attaching a test case to show a problem I recently ran into.
It seams If I load a group of objects with
options(eagerload('someproperty')) where someproperty can be null, I
still get all the options.
If I use a select statement and pass that the the instances method
with options(contains_eager('someproperty')), the instances returned
are only the ones that had the property.
It doesn't seem to me that this is how it is supposed to be though.
Should I file a bug or am I missing some detail on intended behavior?
-Dennis
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from sqlalchemy import *
e=create_engine('sqlite://memory')
ts=Table('ts',e,
Column ( 'id',Integer,primary_key=True),
Column ( 'dat',Integer,nullable=False))
ts.create()
to_oneornone=Table('other',e,
Column ( 'ts_id', Integer,ForeignKey('ts.id'), primary_key=True, nullable=False ),
Column ( 'other_dat', Integer, nullable=False ) )
to_oneornone.create()
class T(object): pass
T.mapper=mapper(T,ts)
class To(object):pass
To.mapper=mapper(To,to_oneornone,properties={'ts':relation(T,backref=backref('other',uselist=False))})
s=create_session()
for x in range(10):
t=T()
t.dat=x
s.save(t)
if x % 2 == 0: # test every other T has an optional data
o=To()
o.other_dat=x
t.other=o
s.save(t)
s.flush()
s.clear()
somedata=s.query(T).options(eagerload('other')).select()
print 'Number results should be 10: ', len(somedata)
s.clear()
sel=select([ts,to_oneornone],
from_obj=[ts.outerjoin(to_oneornone)])
print "Raw select also is 10: " , len(sel.execute().fetchall() )
print "Instances should also be 10: ", len(s.query(T).options(contains_eager('other')).instances(sel.execute()))
