ModelB.objects.filter(modelA__fielddate__range(date1,date2)) Based on the db backend and the number of column you can add an index on fielddate ( check explain output to see if it's useful since it depends on db backend/ dbengine/structure of the table to make it 'inexpensive' )
~ Ronan On Tue, Feb 26, 2013 at 9:59 AM, ozgur yilmaz <yelb...@gmail.com> wrote: > Hi, > > Actually my question is not about the date range. i'm planning to use > __lte and __gte filters. My problem is to solve the query (getting A > objects using B objects) inexpensively. Thanks anyway, > > I used: > > b_objects = B.objects.filter( activity_date__gte = specific_start_date > , activity_date__lte = specific_end_date ) > > a_objects = A.objects.exclude( kisi__in = b_objects ) > > Is it enough? > > 2013/2/26 carlos <crocha09...@gmail.com>: > > Hi, maybe use DateField__range(date1,date2) > > > > Cheers > > > > > > On Tue, Feb 26, 2013 at 5:43 AM, ozgur yilmaz <yelb...@gmail.com> wrote: > >> > >> Hi all, > >> > >> I have to build a query, if possible an inexpensive query: > >> > >> Model A: > >> ... > >> ... > >> > >> Model B: > >> ForeignKey( Model A ) > >> Date > >> ... > >> > >> Model B is an activity with a date field. I want to find which Model A > >> objects didnt join an activity between specific dates. > >> > >> What are the appropriate ways to find this result? Any ideas? > >> > >> Thanks, > >> > >> -- > >> You received this message because you are subscribed to the Google > Groups > >> "Django users" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an > >> email to django-users+unsubscr...@googlegroups.com. > >> To post to this group, send email to django-users@googlegroups.com. > >> Visit this group at http://groups.google.com/group/django-users?hl=en. > >> For more options, visit https://groups.google.com/groups/opt_out. > >> > >> > > > > -- > > You received this message because you are subscribed to the Google Groups > > "Django users" group. > > To unsubscribe from this group and stop receiving emails from it, send an > > email to django-users+unsubscr...@googlegroups.com. > > To post to this group, send email to django-users@googlegroups.com. > > Visit this group at http://groups.google.com/group/django-users?hl=en. > > For more options, visit https://groups.google.com/groups/opt_out. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at http://groups.google.com/group/django-users?hl=en. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- Cordialement / Best Regards Ronan FOUCHER IS / IT -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-users+unsubscr...@googlegroups.com. To post to this group, send email to django-users@googlegroups.com. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
