It seems that 'exclude'ing on a M2M field does not have the effect I
anticipated. Am I doing something wrong? Basically I have the
following models
==========
class Platform(models.Model):
name = models.Charfield(..., unique=True)
class Release(models.Model):
...
platforms = models.ManyToManyField(Platform,
related_name='platforms')
prev_platforms = models.ManyToManyField(Platform,
related_name='prev_platforms')
==========
So I do this:
==========
$ ./manage.py shell
...
In [2]: releases = Release.objects.all()
In [3]: releases.count()
Out[3]: 25278L
In [4]: hppa = releases.filter(platforms__name='hppa')
In [5]: hppa.count()
Out[5]: 3854L
In [6]: # ok, looks good, but
In [7]: hppa_new = hppa.exclude(prev_platforms__name='hppa')
In [8]: hppa_new.count()
Out[8]: 3388L
In [9]: # seems a bit high, and
In [10]: first = hppa_new[0]
In [11]: first.prev_platforms.all()
Out[11]: [<Platform: alpha>, <Platform: arm>, <Platform: hppa>,
<Platform: ia64>, <Platform: mips>, <Platform: ppc>, <Platform: ppc64>,
<Platform: s390>, <Platform: sh>, <Platform: sparc>, <Platform: x86>]
==========
Notice the '<Platform: hppa>' even though I thought I excluded it. I
know I took a shortcut using 'platforms__name' instead of instantiating
the Platform but I get the same result either way. So am I doing
something wrong or is there another way of doing this?
Thanks,
Albert
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