Hi,
I have these two simple models defined (using today's trunk)
class Tag(models.Model):
name = models.CharField(max_length=100)
related = models.ManyToManyField('self', symmetrical=False,
through='TagCorrelation', blank=True)
class TagCorrelation(models.Model):
from_tag = models.ForeignKey(Tag, related_name='related_source')
to_tag = models.ForeignKey(Tag, related_name='related_target')
common_posts = models.IntegerField(blank=True, null=True)
You see, it is a slightly denormalized way to store relation between tags.
Now, after reading the docs at
http://docs.djangoproject.com/en/dev/topics/db/models/, following this
esample:
# Find all the members of the Beatles that joined after 1 Jan 1961
>>> Person.objects.filter(
... group__name='The Beatles',
... membership__date_joined__gt=date(1961,1,1))
[<Person: Ringo Starr]
it seems that it should be possible to query the using attributes of
the intermediate model. So I tried with:
Tag.objects.filter(tagcorrelation__common_posts_gt=1)
but tt does not work, gives this error:
FieldError: Cannot resolve keyword 'tagcorrelation' into field.
Choices are: id, name, post, related, related_source, related_target,
source, tag
Am i missing something?
Thanks
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