#28724: QuerySet filter across m2m returns incorrect number of objects
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Reporter: Zach | Owner: nobody
Type: Bug | Status: new
Component: Uncategorized | Version: 1.11
Severity: Normal | 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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{{{#!python
# models
from django.db import models
class ProductArea(models.Model):
name = models.CharField(max_length=100)
class Product(models.Model):
name = models.CharField(max_length=100)
product_areas = models.ManyToManyField(ProductArea,
through='Relationship')
class MembershipLevel(models.Model):
name = models.CharField(max_length=100)
class Relationship(models.Model):
product = models.ForeignKey(Product)
product_area = models.ForeignKey(ProductArea)
membership_level = models.ForeignKey(MembershipLevel)
}}}
{{{#!python
from myapp.models import MembershipLevel
from myapp.models import ProductArea
from myapp.models import Relationship
from myapp.models import Product
p1, _ = Product.objects.get_or_create(name='My Product')
p2, _ = Product.objects.get_or_create(name='Another Product')
p3, _ = Product.objects.get_or_create(name='Yet another product')
a1, _ = ProductArea.objects.get_or_create(name='Air')
a2, _ = ProductArea.objects.get_or_create(name='Land')
a3, _ = ProductArea.objects.get_or_create(name='Sea')
m1, _ = MembershipLevel.objects.get_or_create(name='gold')
m2, _ = MembershipLevel.objects.get_or_create(name='bronze')
m3, _ = MembershipLevel.objects.get_or_create(name='silver')
Relationship.objects.get_or_create(product=p1, product_area=a1,
membership_level=m1)
Relationship.objects.get_or_create(product=p1, product_area=a2,
membership_level=m2)
Relationship.objects.get_or_create(product=p1, product_area=a3,
membership_level=m3)
Relationship.objects.get_or_create(product=p2, product_area=a1,
membership_level=m1)
Relationship.objects.get_or_create(product=p2, product_area=a2,
membership_level=m2)
Relationship.objects.get_or_create(product=p2, product_area=a3,
membership_level=m3)
Relationship.objects.get_or_create(product=p3, product_area=a1,
membership_level=m1)
Relationship.objects.get_or_create(product=p3, product_area=a2,
membership_level=m2)
Relationship.objects.get_or_create(product=p3, product_area=a3,
membership_level=m3)
# "total found: 3".
print('total found: %s' % Product.objects.count())
# "total with filter found: 9".
print('total with filter found: %s' %
Product.objects.filter(product_areas__relationship__membership_level__name='gold').count())
}}}
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Ticket URL: <https://code.djangoproject.com/ticket/28724>
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