I've got a couple django models that look like this:

from django.contrib.sites.models import Siteclass Photo(models.Model):title = models.CharField(max_length=100)site = models.ForeignKey(Site)file = models.ImageField(upload_to=get_site_profile_path) def __unicode__(self):return self.titleclass Gallery(models.Model):    name = models.CharField(max_length=40)site = models.ForeignKey(Site)photos = models.ManyToManyField(Photo, limit_choices_to = {'site':name} )    def __unicode__(self):return self.name

I'm having all kinds of fun trying to get the limit_choices_to working on the Gallery model. I only want the Admin to show choices for photos that belong to the same site as this gallery. Is this possible?

Yes. You need to override the form that admin uses for the Gallery model, then limit the queryset of the photos field in that form:

class GalleryAdminForm(django.forms.ModelForm):class Meta:model = Gallerydef __init__(self, *args, **kwargs):super(GalleryAdminForm, self).__init__(*args, **kwargs)self.fields['segments'].queryset = Photo.objects.filter(site=self.instance.site)class GalleryAdmin(django.contrib.admin.ModelAdmin):form = GalleryAdminFormdjango.contrib.admin.site.register(Gallery, GalleryAdmin)