Just to explain
q = q | f if q else f
is using the short version of if/else, so let's expand that:
if q:
q = q | f
else:
q = f
q is only False when you have a Q object with no parameters i.e. Q()
and as you may have seen above | means OR. This is because the Q
object implements the __or__ special method.
On 7 Apr, 19:56, Daniel <unagimiy...@gmail.com> wrote:
> Thanks alot guys. If I can be honest, I'm having a little trouble
> digesting just this one line:
>
> q = q | f if q else f
>
> That line of code only allows (q1 | q2 | q3), right?
>
> It will not allow mixing "AND" as well as "OR" (i.e., q1 & q2 | q3)?
>
> Thanks!
>
> On Apr 7, 1:26 pm, Vinicius Mendes <vbmen...@gmail.com> wrote:
>
> > On Wed, Apr 7, 2010 at 2:00 PM, Tom Evans <tevans...@googlemail.com> wrote:
> > > On Wed, Apr 7, 2010 at 5:39 PM, Daniel <unagimiy...@gmail.com> wrote:
> > > > Hi,
>
> > > > Thank you for your help everyone. I know that I need to learn python
> > > > better, and I did read those articles. What is still a bit unclear to
> > > > me, though, is how could I add an "OR" or "AND" separator between Q
> > > > objects?
>
> > > > So I have a list of qobjects like [qObj1, qObj2, qObj3].
>
> > > > What I want is something like Sample.objects.filter((qObj1 | qObj2),
> > > > qObj3)
>
> > > > I know that the default is for all Q objects to be "ANDed" together.
> > > > I think the join operation is not going to work here, nor is
> > > > concatenation, but is there something obvious that I'm missing?
>
> > > > THANK YOU :>
>
> > > Documentation on how to combine Q objects:
>
> > >http://docs.djangoproject.com/en/1.1/topics/db/queries/#complex-looku...
>
> > > So you want to loop through them, and 'or' them together..
>
> > > filters = [ q1, q2, q3, q4, q5 ]
> > > q = None
> > > for f in filters:
> > > q = q | f if q else f
> > > Foo.objects.filter(q)
>
> > Refining a little:
>
> > filters = [q1,q2,q3,q4,q5]
> > q = Q()
> > for f in filters:
> > q |= f
> > Foo.objects.filter(q)
>
> > Q() is identity for & and |.
>
> > > Tom
>
> > > --
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>
> > ______________________
> > Vinícius Mendes
> > Solucione Sistemashttp://solucione.info/
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