带有ManyToMany的GenericTabularInline不显示任何选项

Question

我尝试将GenericTabularInline添加到相关模型的管理员，并且Generic Relation模型的ManyToMany字段不显示任何内容。

models.py

class RelatedIngredients(models.Model):
    content_type = models.ForeignKey(ContentType, verbose_name='Content Type')
    object_id = models.PositiveIntegerField(verbose_name='Object ID')
    content_object = fields.GenericForeignKey('content_type', 'object_id')

    ingredients = models.ManyToManyField(Ingredients)

admin.py

class IngredientInline(GenericTabularInline):
    model = RelatedIngredients
    extra = 0
    min_num = 1
    max_num = 1
    can_delete = False
    fields = ['ingredients',]
    filter_horizontal = ['ingredients',]

@admin.register(Cake)
class CakeAdmin(admin.ModelAdmin):
     fields = ['name', 'description']
     inlines = [IngredientInline,]

出现正确的过滤器水平小部件，但它显示为空。没有任何可用或选择的方面。现在我知道模型的工作原理是我尝试将 RelatedIngredients.ingredients 作为外键并且GenericTabularInline工作。

区别是什么？有什么想法吗？