Django的过滤器或没有记录

Question

我有机型

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

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

class Property(models.Model): 
    property_type = models.ForeignKey(PropertyType) 
    product = models.ForeignKey(Product, related_name='properties') 
    value = models.CharField(...) 

所以，我怎么就可以筛选产品与一些价值和房产类型的属性，包括产品，具有相同的房产类型

东西没有财产这样

properties = Property.objects.filter(property_type__pk=12, value='anyValue') 
products = Product.objects.filter(Q(properties__in=properties)| 
       Q(NO PROPERTY RECORD WITH PROPERTYTYPE__ID=12 FOR PRODUCT)) 

Answer 1

通过经验找到了答案其实

properties = Property.objects.filter(property_type__pk=12, value='anyValue') 
products = Product.objects.filter(Q(properties__in=properties)| 
      ~Q(properties__property_type__pk__in=[12])) 

Answer 2

正确的做法是properties = Property.objects.filter(property_type__pk__contains=12, value='anyValue')我不明白的第二