Thank you, Tom. I understand now. I come from java and I was not aware that such a syntax is allowed. I got the Q objects part of my app working thanks to you guys.
On Apr 8, 8:08 am, Tom M <mediaf...@googlemail.com> wrote: > 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 > > > > > -- > > > > You received this message because you are subscribed to the Google > > > > Groups > > > > "Django users" group. > > > > To post to this group, send email to django-us...@googlegroups.com. > > > > To unsubscribe from this group, send email to > > > > django-users+unsubscr...@googlegroups.com<django-users%2bunsubscr...@googlegroups.com> > > > > . > > > > For more options, visit this group at > > > >http://groups.google.com/group/django-users?hl=en. > > > > ______________________ > > > Vinícius Mendes > > > Solucione Sistemashttp://solucione.info/ -- You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-us...@googlegroups.com. To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/django-users?hl=en.
