Hello.
On 31.10.2014 18:33, Simon King wrote:
At a guess, I would say that the Python code Foo.bar != bar means
that you are looking for Foo objects that aren't related to bar.
This includes Foos that are related to a *different* Bar instance,
as well as Foos that aren't related to *any*
On 3 Nov 2014, at 13:08, Ladislav Lenart lenart...@volny.cz wrote:
Hello.
On 31.10.2014 18:33, Simon King wrote:
At a guess, I would say that the Python code Foo.bar != bar means
that you are looking for Foo objects that aren't related to bar.
This includes Foos that are related to a
Hello.
I have just noticed (by accident) a semantic difference of the not-equal
operator (!=), depending on the style used. For example a query
session.query(Foo).filter(Foo.bar_id != bar.id)
produces SQL like (expected)
SELECT *
FROM foo
WHERE foo.bar_id != %(bar_id_1)s
At a guess, I would say that the Python code Foo.bar != bar means that you
are looking for Foo objects that aren't related to bar. This includes Foos that
are related to a *different* Bar instance, as well as Foos that aren't related
to *any* bar instance. In sql terms, foo.bar_id != bar.id OR
I agree with what Simon said, and want to point out that he is assuming
that that Foo.bar is a relationship of Foo to Bar based on Foo.bar_id =
Bar.id
But you should understand that these are two completely different queries
AND you haven't described your model at all.
