#20152: QuerySet filter() and exclude() when used with annotate() generate same
SQL
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Reporter: raymond.wanyoike@… | Owner: nobody
Type: Bug | Status: new
Component: Database layer (models, ORM) | Version: 1.5
Severity: Normal | Keywords:
Triage Stage: Unreviewed | Has patch: 0
Easy pickings: 0 | UI/UX: 0
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Here are the models:
{{{
#!python
## Models
from django.db import models
class ModelA(models.Model):
aafield = models.IntegerField()
class ModelB(models.Model):
bbfield = models.IntegerField()
model_a = models.OneToOneField(ModelA)
}}}
Here is the query:
{{{
#!python
## QuerySet
from django.db.models import Sum, F
# 1. Get all ModelA objects
# 2. Annotate sum of modelb__bbfield (OneToOne relationship)
# 3. Filter where ModelA.aafield == ModelB.bbfield_sum
result = ModelA.objects.all() \
.annotate(bbfield_sum=Sum('modelb__bbfield')) \
.filter(aafield=F('b_field_sum'))
}}}
Up to this point the generated SQL is valid and correct:
{{{
#!sql
SELECT ... FROM `...` LEFT OUTER JOIN `...` ON (`...` = `...`) GROUP BY
`...`
HAVING `project_modela`.`valid` = SUM(`project_modelb`.`result`)
}}}
Here is the problem, if you change {{{filter()}}} to {{{exclude()}}}, the
same same SQL code is generated. I even tried it using {{{Q()}}} and
{{{~Q()}}} and got the exact same SQL, the filter cannot be negated. In
other words .exclude() and ~Q() have no effect.
I am currently falling back to {{{aafield__gt}}} and {{{aafield__lt}}} to
have get the effect of == and !=
--
Ticket URL: <https://code.djangoproject.com/ticket/20152>
Django <https://code.djangoproject.com/>
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