Thanks for the replies. I should use exclude, to find A objects, so should try this i think:
ModelB.objects.exclude(modelA__fielddate__range(date1,date2)) 2013/2/26 Ronan Foucher <[email protected]>: > 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. > > -- 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.
