limit_choices_to & get_sql()

[Nicolas Steinmetz]

Hello,

I would like to present only a subset of a given models. But so far,
in the admin, I have no value whereas there should be some.

I tried several syntax but did not find the right one.

Here are my implicated (and simplified) models :

class Dns(models.Model):
    """
    DNS description
    """
    TYPEDNS_CHOICES = (
        ('1', 'Reference'),
        ('2', 'Normal'),
    )
    name = models.CharField(blank=True, max_length=100)
    dnstype = models.CharField(max_length=100,
choices=TYPEDNS_CHOICES)

class Url(models.Model):
    """
    Url description
    """
    name = models.CharField(blank=True, max_length=100)
    [...]
    cnamevalue = models.ForeignKey(Dns, limit_choices_to = {'dns':
'get_sql(Dns.dnstype="2")'}, blank=True)

Could someone explain me what is the right syntax ?

I could use formfield_for_foreignkey for admin contrib but I would
prefer using limit_choices_to that I see as a native solution.

http://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.formfield_for_foreignkey

Thanks,
Nicolas

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