Django RAW SQL query how to pass date comparison - django

Question

I am working with Django Raw SQL as I want to build a relatively complex query,
As part of it, I have a case statement that says 'if the date on the record is < today then 1 else 0 - this works.
overdue_phases = task.objects.filter(orgid=orgid, taskid=taskidx).raw('''
SELECT '1' as id, case when research_due < "2022-12-01" AND research_status != "done" then 1 else 0 end as count
from app_task where taskid = "''' + taskidx + '''"''')
overdue_phases = task.objects.filter(orgid=orgid, taskid=taskidx).raw('''
SELECT '1' as id, case when research_due < "2022-12-01" AND research_status != "done" then 1 else 0 end as count
from app_task where taskid = "''' + taskidx + '''"''')
However, when I want to swap the hard coded date for TODAY() I can't make it work. I have tried passing a python date variable into the script (td = datetime.date.today()), but it doesn't return the right results!
Can anyone advise me please?

Answer 1

There is no need to do this. You can use condition expressions [Django-doc]:
from django.db.models import Case, Q, Value, When
overdue_phases = task.objects.filter(orgid=orgid, taskid=taskidx).annotate(
count=Case(
When(
~Q(research_status='done'),
research_due__lt='2022-12-01',
then=Value(1),
),
default=Value(0),
)
)
Or if a boolean is sufficient as well:
from django.db.models import Q
overdue_phases = task.objects.filter(orgid=orgid, taskid=taskidx).annotate(
count=~Q(research_status='done') & Q(research_due__lt='2012-12-01')
)
or for older versions of Django with an ExpressionWrapper [Django-doc]:
from django.db.models import BooleanField, ExpressionWrapper, Q
overdue_phases = task.objects.filter(orgid=orgid, taskid=taskidx).annotate(
count=ExpressionWrapper(
~Q(research_status='done') & Q(research_due__lt='2012-12-01'),
output_field=BooleanField(),
)
)
You can replace '2022-12-01' with date.today().