Question

我的模特是：

users = users.filter(offers__publicationDate__range=[startdate, enddate]). prefetch_related(Prefetch('offers', queryset=Offer.objects.filter(
publicationDate__range=[startdate, enddate]))).distinct()

我正在尝试在查询集上应用多个过滤器：

users = users.filter(offers__description__icontains=sometext).prefetch_related(Prefetch('offers', queryset=Offer.objects.filter(description__icontains=sometext))).distinct()

然后

ValueError: 'offers' lookup was already seen with a different queryset. You may need to adjust the ordering of your lookups.

第一个工作正常，另一个抛出以下异常：

    if (offerBeginDate != None and offerEndDate != None):
        b = offerBeginDate.split('-')
        e = offerEndDate.split('-')

        startdate = datetime.date(int(b[0]), int(b[1]), int(b[2]))
        enddate = datetime.date(int(e[0]), int(e[1]), int(e[2]))

        users = users.filter(offers__publicationDate__range=[startdate, enddate])
        offers = offers.filter(publicationDate__range=[startdate, enddate])

    if (descriptionText != None):

        users = users.filter(offers__functionDescription__icontains=descriptionText.strip())
        offers = offers.filter(functionDescription__icontains=descriptionText.strip())


    users = users.prefetch_related('offers', Prefetch(queryset=offers))

更新

我目前的代码是：

{{1}}

有任何帮助吗？谢谢大家：）））

Answer 1

您可以使用to_attr对象的Prefetch参数来预取其他查询集：

users = users.filter(offers__description__icontains=sometext).prefetch_related(
        Prefetch('offers', queryset=Offer.objects.filter(
publicationDate__range=[startdate, enddate]), to_attr='date_offers'), 
        Prefetch('offers', queryset=Offer.objects.filter(description__icontains=sometext), to_attr='description_offers')).distinct()

<强> UPD

如果需要动态地向预取查询集添加过滤器，可以单独定义它：

if some_case:
    users = users.filter(offers__description__icontains=sometext)
    offers=Offer.objects.filter(description__icontains=sometext)
if some_case_2:
    users = users.filter(**conditions)
    offers = offers.filter(**conditions)

users = users.prefetch_related(Prefetch('offers', queryset=offers))

现在，用户查询集中的每个用户都有两个属性：user.date_offers和user.description_offers。

过滤查询集，应用多个过滤器

1 个答案: