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 <[email protected]> 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 <[email protected]>: > > Hi, maybe use DateField__range(date1,date2) > > > > Cheers > > > > > > On Tue, Feb 26, 2013 at 5:43 AM, ozgur yilmaz <[email protected]> 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 [email protected]. > >> To post to this group, send email to [email protected]. > >> 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 [email protected]. > > To post to this group, send email to [email protected]. > > 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 [email protected]. > To post to this group, send email to [email protected]. > 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/django-users?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
