Fabio,
If you define de foreignkey in the license model, you can create persons
without a problem. The only requirement then for creating a license would be
that it needs an existing person. Something like this:
class Person(models.Model):
name = models.CharField(max_length=30)
class License(models.Model):
person = models.ForeignKey(Person)
number = models.IntegerField(max_length=10)
Regards,
Gerard.
Fabio Natali wrote:
> Hi all!
>
> I have two models, Person and License.
>
> class License(models.Model):
> number = models.IntegerField(max_length=10)
>
> class Person(models.Model):
> name = models.CharField(max_length=30)
> license = models.ForeignKey(License,verbose_name="Centro di
> costo",blank=True,null=True)
>
> class PersonAdmin(admin.ModelAdmin):
> list_display = ('name', 'license')
> ordering = ('name','license')
> list_filter = ('name','license')
>
> As you can see, a new person can be added with no license at all:
> "blank=True,null=True" options. That's what I want.
>
> In my admin panel I get the list of all the persons I have added. I
> wish I could filter or order this list so that I get all the persons
> that have no license.
>
> The point is, if I use "blank=True,null=True" I'm not allowed to have
> this filtering/ordering in my admin panel. (The table I get in the
> admin panel can't be ordered by the column "license".)
>
> If I only use the "blank=True" option, then I am allowed to order by
> license but no "empty" values are then allowed when adding a new
> person. This way, each person must have a license, which is not the
> case.
>
> Well, I guess I could use a not-existing license number instead of
> null. For example 0000000000 instead of NULL. But it seems tricky and
> I might need that number in the future.
>
> How can I solve this?
>
> Thanks, Fabio.
>
--
urls = { 'fun': 'www.zonderbroodje.nl', 'tech': 'www.gp-net.nl' }
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