On Wed, 2006-05-17 at 14:45 +0200, Guillermo Fernandez Castellanos
wrote:
> Hi,
>
> I'm very new to Django, and I'm a bit overhelmed with doc, so I might
> have missed something. Thanks for redirecting me then :-)
>
> I've this model (simplified):
>
> class Department(models.Model):
> name = models.CharField(maxlength=10,primary_key=True)
> class Admin:
> pass
>
> class Job(models.Model):
> name = models.CharField(maxlength=30,primary_key=True)
> department = models.ForeignKey(Department)
> class Admin:
> pass
>
> class Person(models.Model):
> name = models.CharField(maxlength=30,primary_key=True)
> job = models.ForeignKey(Job)
>
> def _get_branch(self):
> return Job.objects.select_related().get(name=self.job.name).department
> department = property(_get_department)
>
> class Admin:
> list_display = ('name','job','department')
> list_filter = ('job','department')
> search_fields = ('name')
>
> My problem is that 'department' in list_display works just great,
> while in list_filter in makes an error:
> Request Method: GET
> Request URL: http://127.0.0.1:8000/admin/unitmanager/unit/
> Exception Type: FieldDoesNotExist
> Exception Value: name=branch
> Exception Location: c:\program
> files\python24\lib\site-packages\django-0.91-py2.4.egg\django\db\models\options.py
> in get_field, line 97
>
> Why is there an error? Is there a way to do what I want?
This is kind of hidden, but it is in the documentation: list_display can
take functions (and also properties), whereas list_filter can only take
fields from your model. "Department" is not a field, it's essentially a
function call (disguised as an attribute reference). The reason for
this is that the fields in list_filter are used directly in an SQL
statement used to query the database, so we cannot have Python code at
that level.
Regards,
Malcolm
>
> Thanks,
>
> G
>
> >
>
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