Found the answer here;
http://groups.google.com/group/django-users/browse_thread/thread/89b4146892801ed4/17f2d26e10709ba0?lnk=gst&q=foreignkey+list_filter#17f2d26e10709ba0
Short version: "If you only have one record in the table related to
your foreign key,
then the filter list will not show up at the side of the admin screen.
"
On Jun 8, 12:44 am, Rodrigo Cea <rodrigo...@gmail.com> wrote:
> I have a model with 4 ForeignKeys: 'autor','categoria','edicion' and
> 'dossier'. In admin.py, I am trying to assign them as "list_filter".
> However, only 2 of them actually show up within the filters, 'autor'
> and 'categoria'. All four show up as columns without any problems.
> Does anybody have any clues as to why some FKs show up as filters and
> some don't?
>
> The code:
>
> ### in models.py
>
> ### these show up
> class Autor(BaseModel):
> """Un autor"""
> user = models.ForeignKey(User, unique=True, blank=True, null=True)
> nombre = models.CharField(max_length=200, help_text="""Ejemplo:
> Iván Pinto""")
> nota = models.TextField(blank=True)
> subeditor = models.BooleanField(default=False)
>
> def __unicode__(self):
> return u"%s" % self.nombre
>
> def get_absolute_url(self):
> return "/autor/%s/%s" % (slugify(self.nombre), self.id)
>
> class Meta:
> ordering = ['nombre']
> verbose_name, verbose_name_plural = "Autor", "Autores"
>
> class Categoria(BaseModel):
> """categorias para articulos"""
> nombre = models.CharField(blank=True, max_length=80)
> slug = models.SlugField()
>
> def __unicode__(self):
> return self.nombre
>
> def get_absolute_url(self):
> return "/categoria/%s/" % (self.slug)
>
> class Meta:
> ordering = []
> verbose_name, verbose_name_plural = "Categoría", "Categorías"
>
> ### these don't:
> class Edicion(BaseModel):
> """Una edicion, con titulo, fecha"""
>
> titulo = models.CharField(max_length=200)
> numero = models.IntegerField(unique=True)
> diseno = models.ForeignKey("Diseno", verbose_name="Diseño")
> fecha_de_publicacion = models.DateField()
> publicar = models.BooleanField()
>
> def __unicode__(self):
> return self.titulo
>
> def get_absolute_url(self):
> if self.fecha_de_publicacion:
> return "/portadas/%s-%s/%s" % (
> self.fecha_de_publicacion.year,
> slugify(self.titulo),
> self.numero)
>
> class Meta:
> ordering = ['-numero']
> verbose_name, verbose_name_plural = "Edición", "Ediciones"
>
> class Dossier(BaseModel):
> """Un dossier que contiene varios artículos"""
> titulo = models.CharField(max_length=200)
> subtitulo = models.CharField(blank=True, max_length=200)
> texto = models.TextField(blank=True)
> edicion = models.ForeignKey(Edicion)
> imagen = models.ImageField(upload_to="dossier")
> ubicacion = models.IntegerField("Ubicación en portada",
> choices=ubicacion_choices, default=1)
>
> class Meta:
> ordering = []
> verbose_name, verbose_name_plural = "Dossier", "Dossieres"
>
> def __unicode__(self):
> return "%s" % self.titulo
>
> def get_absolute_url(self):
> return "/dossier/%s/%s/" % (slugify(self.titulo), self.id)
>
> ### in admin.py:
> class ArticuloAdmin(admin.ModelAdmin):
> list_display = ( 'autor','categoria','edicion','dossier')
> list_filter = ('autor','categoria','edicion','dossier')
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