Hi,
I'm trying to use list_display in the django-admin, and I can't seem to find
a way to get list_display to follow FK links.
My models.py:
class Site(models.Model):
name = models.CharField(max_length=50, unique=True)
description = models.TextField()
def __unicode__(self):
return u'%s' % (self.name)
class AccommodationFeature(models.Model):
name = models.CharField(max_length=50, unique=True)
description = models.TextField()
class AccommodationRoom(models.Model):
name = models.CharField(max_length=50)
site = models.ForeignKey(Site)
features = models.ManyToManyField(AccommodationFeature, null=True,
blank=True)
def __unicode__(self):
return u'%s' % (self.name)
class BedAvailability(models.Model):
number_of_single_beds = models.IntegerField()
number_of_double_beds = models.IntegerField()
conference = models.ForeignKey(Conference)
accommodation_room = models.ForeignKey(AccommodationRoom)
class Meta:
verbose_name_plural = 'bed availabilities'
def __unicode__(self):
return u'Availability for %s at %s' % (self.accommodation_room,
self.conference)
# Surely this isredundant? hmm, list_dispaly doesn't seem to follow
foreignkey relationships?
def site_name(self):
return u'%s' % (self.accommodation_room.site.name)
Each "Site" has multiple "AccommodationRooms", which in turn have
"BedAvailabilities".
In the BedAvailabilitiesAdmin, for list_display, I'm trying to follow
self.accommodation_room.site. This doesn't work using either dot notation or
double-underscore notation.
Other ModelAdmin options seem to allow following FK links, using the double
underscore notation.
E.g. ModelAdmin.search_fields allows you to search across FK's using:
search_fields = ['foreign_key__related_fieldname']
list_filter also seems to allow the same behaviour.
At the moment, I'm just using a function on BedAvailabilities to follow the
relationships and print the site name. However, this seems a bit silly when
logic would dictate that list_display behaves the same as search_fields and
list_filter.
Is there any reason this feature doesn't work for list_display?
There's some discussion of it on SO:
http://stackoverflow.com/questions/163823/can-list-display-in-a-django-modeladmin-display-attributes-of-foreignkey-fields
And a ticket for it her:
http://code.djangoproject.com/ticket/5863
but discussion seems to have petered off. Is there a technical or design
reason for this?
Cheers,
Victor
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