no objects found

[Brian May]

Continued from <​http://groups.google.com/group/django-users/browse_thread/thread/bc3ecc16c3def53b>

Python 2.5.2 (r252:60911, Oct 5 2008, 19:24:49)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)

import inventory.models as models
object=models.software.objects.get(id=267)
print models.software_installation.objects.filter(software=object).count()

10

print models.software_installation.objects.filter(software=object)

[]

print models.software_installation.objects.filter(software=object).query.as_sql()

('SELECT inventory_software_installation.id, inventory_software_installation.software_id, inventory_software_installation.license_key_id FROM inventory_software_installation INNER JOIN inventory_software ON (inventory_software_installation.software_id = inventory_software.id) LEFT OUTER JOIN inventory_license_key ON (inventory_software_installation.license_key_id = inventory_license_key.id) INNER JOIN inventory_software T4 ON (inventory_license_key.software_id = T4.id) INNER JOIN inventory_license ON (inventory_license_key.license_id = inventory_license.id) INNER JOIN inventory_software T6 ON (inventory_license.software_id = T6.id) WHERE inventory_software_installation.software_id = %s ORDER BY inventory_software.name ASC, T4.name ASC, T6.name ASC, inventory_license.vendor_id ASC, inventory_license_key.key ASC', (267,))

quit()

--- cut ---

class software(models.Model):

name = models.CharField(max_length=100)
class Meta:

ordering = ('name',)

class license(models.Model):

software = models.ForeignKey(software)
vendor_id = models.CharField(max_length=10,null=True,blank=True)
class Meta:

ordering = ('software','vendor_id')

class license_key(models.Model):

software = models.ForeignKey(software)
license = models.ForeignKey(license)
key = models.CharField(max_length=50,null=True,blank=True)
class Meta:

ordering = ('software','license','key')

class software_installation(models.Model):

software = models.ForeignKey(software)
license_key = models.ForeignKey(license_key,null=True,blank=True)
class Meta:

ordering = ('software','license_key')

--- cut ---

The ordering Meta tag is important; if I remove the appropriate meta tags (I haven't worked out which ones yet), then everything works fine.

Brian May

PS Thanks for the very prompt response.