Re: Querying for objects created on a certain date
Karen, I'm aware that my 30-days-ago version of the query is current time/ date specific. Good catch :-) Thanks for the solution. I also found this one: today = datetime.datetime.today() Document.objects.filter(created_on__month=today.month, created_on__day=today.day, created_on__year=today.year) Thanks again. On Oct 12, 5:00 pm, Karen Tracey wrote: > On Mon, Oct 12, 2009 at 5:07 PM, aa56280 wrote: > > > I have a DateTimeField called "created_on" on a model called > > "Documents". It serves as a timestamp for when the record was added. > > > I'm trying to write a query that will return all Documents created_on > > a particular date, say today. I can make it work if I look for a > > record within a range of dates... > > > > > today = datetime.datetime.today() > > thirty_days_ago = today - datetime.timedelta(days=30) > > Document.objects.filter(created_on__range=(thirty_days_ago, today)) > > > > > But now, I need to find records that were created on a particular > > date, like, today. > > > How do I do that? > > today_end = datetime.datetime.combine(datetime.date.today(), > datetime.time.max) > today_start = datetime.datetime.combine(datetime.date.today(), > datetime.time.min) > Document.objects.filter(created_on__range=(today_start, today_end)) > > You realize your 30-days-ago version of the query returns values that depend > on the current time as well as the current date when the query is run? This > may be rather surprising behavior for people who would likely expect the > list of things created within the last 30 days to be constant over the > course of a day (excepting things added during the day). > > Karen --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@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 -~--~~~~--~~--~--~---
Re: Querying for objects created on a certain date
On Mon, Oct 12, 2009 at 6:00 PM, phoebebright wrote: > > Try this: > > from datetime import date > > today = date.today() > > todays_stuff = Stuff.objects.filter(created_on = today) > > Looking at the SQL that generates for a model that contains a DateTimeField, not a DateField, I don't believe that will do what's wanted: >>> from datetime import date >>> today = date.today() >>> today datetime.date(2009, 10, 12) >>> Document.objects.filter(created_on=today) [] >>> from django.db import connection >>> connection.queries[-1]['sql'] u'SELECT `ttt_document`.`id`, `ttt_document`.`created_on`, `ttt_document`.`name` FROM `ttt_document` WHERE `ttt_document`.`created_on` = 2009-10-12 00:00:00 LIMIT 21' >>> It will only find stuff created at midnight, exactly. (Unless the same use-a-date-for-a-datetime technique is used when adding as well, so that the times will always be 0, in which case it ought to be just a DateField.) Karen --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@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 -~--~~~~--~~--~--~---
Re: Querying for objects created on a certain date
Try this: from datetime import date today = date.today() todays_stuff = Stuff.objects.filter(created_on = today) On Oct 12, 10:07 pm, aa56280 wrote: > I have a DateTimeField called "created_on" on a model called > "Documents". It serves as a timestamp for when the record was added. > > I'm trying to write a query that will return all Documents created_on > a particular date, say today. I can make it work if I look for a > record within a range of dates... > > > today = datetime.datetime.today() > thirty_days_ago = today - datetime.timedelta(days=30) > Document.objects.filter(created_on__range=(thirty_days_ago, today)) > > > But now, I need to find records that were created on a particular > date, like, today. > > How do I do that? > > Any thoughts greatly appreciated. --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@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 -~--~~~~--~~--~--~---
Re: Querying for objects created on a certain date
On Mon, Oct 12, 2009 at 5:07 PM, aa56280 wrote: > > I have a DateTimeField called "created_on" on a model called > "Documents". It serves as a timestamp for when the record was added. > > I'm trying to write a query that will return all Documents created_on > a particular date, say today. I can make it work if I look for a > record within a range of dates... > > > today = datetime.datetime.today() > thirty_days_ago = today - datetime.timedelta(days=30) > Document.objects.filter(created_on__range=(thirty_days_ago, today)) > > > But now, I need to find records that were created on a particular > date, like, today. > > How do I do that? > > today_end = datetime.datetime.combine(datetime.date.today(), datetime.time.max) today_start = datetime.datetime.combine(datetime.date.today(), datetime.time.min) Document.objects.filter(created_on__range=(today_start, today_end)) You realize your 30-days-ago version of the query returns values that depend on the current time as well as the current date when the query is run? This may be rather surprising behavior for people who would likely expect the list of things created within the last 30 days to be constant over the course of a day (excepting things added during the day). Karen --~--~-~--~~~---~--~~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@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 -~--~~~~--~~--~--~---
