过滤器相关型号

Question

请参考我的模型（3型号：变体，交易和广告系列）。

我想获得一个变体及其相关交易的列表，其活动开始日期是今天。

我已经能够过滤广告系列的开始日期，但是，返回的交易列表未被过滤。

def get_queryset(self): 

    """ 

     Override get_queryset to cater for dynamic filtering 

    """ 

    date_filters = [] 

    from_date = self.request.GET.get('from', None) 

    if from_date is not None and len(from_date) > 0: 
     date_filters.extend([Q(deal_set__campaign_start_date__gte=parse_date(from_date)),]) 
    else: 
     date_filters.extend([Q(deal_set__campaign_start_date__gte=now()),]) 

    to_date = self.request.GET.get('to', None) 

    if to_date is not None and len(to_date) > 0: 
     date_filters.extend([Q(deal_set__campaign_end_date__lte=parse_date(to_date)),]) 

    return Variant.objects.filter(*date_filters).distinct() 

class Variant(BaseModel): 

    """ 

    Product model 

    """ 

    variant_id = models.AutoField(primary_key=True) 
    unit = models.ForeignKey(Unit, on_delete=models.CASCADE) 
    value = models.DecimalField(max_digits=3, decimal_places=2, default=Decimal('0.0')) 
    product = models.ForeignKey(Product, on_delete=models.CASCADE) 

class Deal(BaseModel): 

    """ 

    Deal model 

    """ 

    deal_id = models.AutoField(primary_key=True) 
    price = models.DecimalField(max_digits=4, decimal_places=2) 
    variant = models.ForeignKey(Variant, on_delete=models.CASCADE) 
    campaign = models.ForeignKey(Campaign, on_delete=models.CASCADE) 

class Campaign(BaseModel): 

    """ 

    Campaign model 

    """ 

    campaign_id = models.AutoField(primary_key=True) 
    start_date = models.DateField(default=now()) 
    end_date = models.DateField(default=now()) 
    store = models.ForeignKey(Store, on_delete=models.CASCADE) 

Answer 1

您是否想要所有变体或仅有变体具有今天活动开始日期的交易？

对于后者，应该是这样的：

from datetime import date 

Variant.objects.filter(deal_set__campaign__start_date=date.today()) 

如果需要用select_related结合起来。