#25307: Cannot use .annotate with conditional expressions
-------------------------------------+-------------------------------------
Reporter: jproffitt | Owner: nobody
Type: Bug | Status: new
Component: Database layer | Version: 1.8
(models, ORM) |
Severity: Normal | Resolution:
Keywords: | Triage Stage:
| Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by martsberger):
I have the same issue, here is enough code to reproduce the issue.
{{{
# In models.py
from django.db import models
class DateModel(models.Model):
date1 = models.DateTimeField()
date2 = models.DateTimeField()
# elsewhere
from django.db.models import Q, Case, When
from django.db.models.functions import Coalesce
from datetime import date
annotate = {'date': Coalesce('date1', 'date2')}
dms = DateModel.objects.annotate(**annotation)
aggregation = {
'count_recent': Count(Case(When(Q(date__gte=date(year=2015, month=1,
day=1)))))
}
dms = dms.aggregate(**aggregation)
}}}
AttributeError: 'WhereNode' object has no attribute
'get_source_expressions'
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Ticket URL: <https://code.djangoproject.com/ticket/25307#comment:2>
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