Django過濾器過濾外部模型

Question

我有兩種模式

class Sku(models.Model):
    manufacturer = models.ForeignKey('Manufacturer')

class Manufacturer(models.Model):
    title = models.CharField()

我希望在篩選中僅出現與當前sku集相關的制造商。

my view part:
 c['skus'] = self.object.skus.filter(hide=False, prices__price_type=PRICE_ROZN).prefetch_related('prices',
                                                                                                        'stock').all().order_by(
            'prices__value')
        sku_filter = SkuFilter(self.request.GET, c['skus'])

如果此時存在Self，我將以這種方式過濾掉制造商：

class SkuFilter(django_filters.FilterSet):
    # manufacturer__title = django_filters.CharFilter(lookup_expr='icontains')


    manufacturer = django_filters.filters.ModelMultipleChoiceFilter(
        name='manufacturer',
        to_field_name='title',
        queryset=Manufacturer.objects.filter(
            pk__in=self.queryset.objects.values_list('manufacturer').distinct()),

    )

    class Meta:
        model = Sku
        fields = ['manufacturer', ]

但是很明顯，在給定的時刻，自我還不存在。

Answer 1

我通過這種方法解決了這個問題：

1. 創建沒有過濾的字段，例如（Manufacturer.objects.all（））

2. 等待元類魔術創建base_fitler字段

3. 覆蓋init並替換當前過濾器

    class SkuFilter(django_filters.FilterSet): def __init__(self, data=None, queryset=None, prefix=None, strict=None): self.base_filters['manufacturer'] = django_filters.filters.ModelMultipleChoiceFilter( name='manufacturer', to_field_name='title', queryset=Manufacturer.objects.filter( pk__in=queryset.values_list('manufacturer').distinct()), ) super().__init__(data, queryset, prefix, strict) manufacturer = django_filters.filters.ModelMultipleChoiceFilter( name='manufacturer', to_field_name='title', queryset=Manufacturer.objects.all() ) class Meta: model = Sku fields = ['manufacturer', ]