Now i get it :) Thanks. On Tuesday, December 30, 2014 8:51:14 PM UTC+3:30, Michael Bayer wrote: > > > > Mehdi <mese...@gmail.com <javascript:>> wrote: > > Hi > This is making me mad :( > I have two tables without defined relations in their models(i have to make > my app works with given db) and this is how i make a join query: > subq = DBSession.query(models.ZT_420_001.ma_master_code, > models.ZT_420_001.ma_region, > models.ZT_420_001.ma_subs, > models.ZT_420_001.ma_grid, > models.ZT_420_001.ma_xutm, > models.ZT_420_001.ma_yutm).subquery() > query = DBSession.query(models.StatSheet).\ > join(subq, and_(models.StatSheet.ma_region_id == subq.c.ma_region, > models.StatSheet.ma_utm_x == subq.c.ma_xutm, > models.StatSheet.ma_utm_y == subq.c.ma_yutm, > models.StatSheet.ma_unique_code == func.TO_CHAR( > subq.c.ma_subs)) > ).filter(models.StatSheet.ma_resource_type_id == 1) > > Now when i run query by query.all() it gives me 1803 records but when i > use execute and fetchall, i'll have 1810 rows! > results = query.all() #=> returns 1803 rows > results = DBSession.execute(query).fetchall() #=> returns 1810 rows > > I checked the result by running the same query in oracle sqldeveloper and > the correct result was 1810. > So why is this happening? > > > > the ORM when asked to return full entities (e.g. mapped Python objects) > will only return one object per primary key identity in the underlying > result set. This is so that eager loading such as joined-eager loading > doesn’t result in the same object returned many times for each item in a > related collection. > > >
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