Michael,
Michael Bayer wrote:
> ...
> if CellarBook, Cbvintage, etc. are mapped classes, the join and
> outerjoin functions you must be using are "from sqlalchemy.orm import
> join, outerjoin". those are aware of ORM mapped classes whereas
> sqlalchemy.sql.expression.join/outerjoin are not.
>
> You can use the outerjoin() attached to Qeury for the whole thing, i.e.:
>
> query(Class1).outerjoin(Class2, Class3)
>
> if the ON condition is required:
>
> query(Class1).outerjoin((Class2, Class1.foo==Class2.bar), (Class3,
> Class3.bar==Class2.foo))
>
O.K. that looks easy, and I tried this before but I don't get the
result I am looking for.
wines = session.query(db.Cellarbook).outerjoin(db.Cbvintage, db.Cbbottle)
print wines # if I use this sql select in my db ide I get 8 rows
for wine in wines.all():
print wine
print '\n'
If I use the generated SQL I get 8 rows, but in my for loop above I only
get 5.
i.e. I get the following: (note the integer at the end is the
dbCellarbook.primarykey, so this "duplicated" rows have more then one
row in cbvintage and possible in cbbottle).
Glen Elgin Virgin Oak Glen Elgin Virgin Oak 141
Ardbeg Renaissance Ardbeg Renaissance 142
Ch. St. Georges Ch. St. Georges 144
Ch. St. Georges Ch. St. Georges 144
Ch. St. Georges Ch. St. Georges 144
Goldwater Esslin Goldwater Esslin, Merlot 145
Goldwater Esslin Goldwater Esslin, Merlot 145
Goldwater Zell Goldwater Zell 146
Maybe I am asking the question incorrectly.
In other words:
db.Cellarbook (a wine)
- relates (oneToMany) to db.Cbvintage (zero or more vintages)
- which in turn relates (oneToMany) to db.Cbbottle (zero or more bottle
sizes)
What do I need to do to get the 8 rows in my for loop? Can I do this
with just a query or do I need to look into other things.
As always thanks a lot for your help
Werner
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