python - Django MTM 字段 : limit_choices_to = other_ForeignKeyField_on_same_model?

Question

我有几个看起来像这样的 django 模型:

from django.contrib.sites.models import Site

class 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.title


class 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

我在尝试让 limit_choices_to 在 Gallery 模型上工作时遇到了各种乐趣。我只希望管理员显示与该画廊属于同一网站的照片的选择。这可能吗？

Answer 1

是的。您需要覆盖管理员用于 Gallery 模型的表单，然后限制该表单中 photos 字段的查询集:

class GalleryAdminForm(django.forms.ModelForm):

    class Meta:
        model = Gallery

    def __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 = GalleryAdminForm

django.contrib.admin.site.register(Gallery, GalleryAdmin)