I’ve got a field in one model like
class Sample(models.Model): date = fields.DateField(auto_now=False)
Now, I need to filter the objects by a data range, for example, all the objects that has date between 1 Jan 2011 to 31 Jan 2011?
Thanks for your help!
Or if you are just trying to filter month wise:
As Bernhard Vallant said, if you want a queryset which excludes the
specified range ends you should consider his solution, which utilizes gt/lt (greater-than/less-than).
import datetime samples = Sample.objects.filter(sampledate__gte=datetime.date(2011, 1, 1), sampledate__lte=datetime.date(2011, 1, 31))
When doing django ranges with a filter make sure you know the difference between using a date object vs a datetime object. __range is inclusive on dates but if you use a datetime object for the end date it will not include the entries for that day if the time is not set.
startdate = date.today() enddate = startdate + timedelta(days=6) Sample.objects.filter(date__range=[startdate, enddate])
returns all entries from startdate to enddate including entries on those dates. Bad example since this is returning entries a week into the future, but you get the drift.
startdate = datetime.today() enddate = startdate + timedelta(days=6) Sample.objects.filter(date__range=[startdate, enddate])
will be missing 24 hours worth of entries depending on what the time for the date fields is set to.
You can get around the “impedance mismatch” caused by the lack of precision in the
DateTimeField/date object comparison — that can occur if using range — by using a datetime.timedelta to add a day to last date in the range. This works like:
start = date(2012, 12, 11) end = date(2012, 12, 18) new_end = end + datetime.timedelta(days=1) ExampleModel.objects.filter(some_datetime_field__range=[start, new_end])
As discussed previously, without doing something like this, records are ignored on the last day.
Edited to avoid the use of
datetime.combine — seems more logical to stick with date instances when comparing against a
DateTimeField, instead of messing about with throwaway (and confusing)
datetime objects. See further explanation in comments below.
Works for me