Django query chaining multiple filters

Question

This is my schedule object,

class Schedule(Base):
    tournament = models.ForeignKey(Tournament, on_delete=models.CASCADE, null=True)
    first_team = models.ForeignKey(Team, related_name="first_team", on_delete=models.CASCADE, null=True)
    second_team = models.ForeignKey(Team, related_name="second_team", on_delete=models.CASCADE, null=True)
    first_score = models.IntegerField(default=0, null=True)
    second_score = models.IntegerField(default=0, null=True)
    sport = models.ForeignKey(Sport, on_delete=models.CASCADE, null=True)
    date = models.DateTimeField()

I want to fetch the schedules for a specific sport, for the past 30 days for tournaments which have anything other than a 0.0 bias.

This is my query

schedules = Schedule.objects.filter(sport=sport).filter(date__gte=date.today()).filter(
                        date__lte=(date.today() + timedelta(days=30))).order_by("date").exclude(tournament__bias=0.0)

This doesn't work, can someone help me here. Thanks.

Answer 1

Your code is correct way of filtering (although you could merge the two filter() methods by comma-separating the lookups).

The problem might be that you're now filtering for:

today() <= date <= today() + 30 days 

So if you don't have any instances with a date in the future 30 days (or today), you'll get an empty set.

Answer 2

Just to be sure, you should be using tz.now() instead of date.today() , because you probably have USE_TZ = True (the default value). See the django docs .

Also, you have to invert your date filters, because you are searching for 30 days into the future, not the past.

import datetime
from django.utils import timezone as tz

today = tz.localtime(tz.now()).date()
start_date = today - datetime.timedelta(days=30)
end_date = today

schedules = Schedule.objects.exclude(tournament__bias=0.0) \
    .filter(sport=sport, date__gte=start_date, date__lte=end_date) \
    .order_by("date")

Answer 3

Your chaining filter looks like almost correct but i guess you messing with past 30 days section filtering.

schedules = Schedule.objects.filter(sport=sport).filter(date__lt=date.today()).filter(
                        date__gte=(date.today() - timedelta(days=30))).order_by("date").exclude(tournament__bias=0.0)