如何将多个 QuerySet 值传递给 filter()

Question

我有 3 个模型，一个是拍卖，第二个是关注列表，第三个是用户

class Auctions(models.Model):
    lot = models.CharField(max_length=64)
    owner = models.CharField(max_length=64)
    url = models.CharField(max_length=256, blank = True)
    startBid = models.IntegerField()
    description = models.CharField(max_length=64)
    category = models.CharField(max_length=64, blank = True)

class User(AbstractUser):
    pass

class Watchlist(models.Model):
    user = models.CharField(max_length=64)
    watchlist = models.CharField(max_length=64, blank = True)

观看次数：

def addToWatchlist(request, id):
    print(id, "ID")
    user = request.user
    watchlist = Watchlist.objects.filter(user = user, watchlist = id)
    data = list(watchlist)
    if data == []:
        createWatchList = Watchlist(
            user = request.user,
            watchlist = id
        )
        createWatchList.save()
    else:
        watchlist.delete()

    return redirect('listing', id=id)
    

def watchlist(request):
    id = Watchlist.objects.filter(user = request.user)
    auctions = Auctions.objects.filter(id = id)
    return render(request, "auctions/watchlist.html", {
        "auctions": auctions
    })

我收到一个错误“ValueError：精确查找的 QuerySet 值必须限制为使用切片的一个结果。” 有人可以解释如何将多个 QuerySet 值传递给 filter() 结果，我需要所有拍卖，这与监视列表相符 谢谢！

Answer 1

试试这个：

watchlist_id = Watchlist.objects.filter(user = request.user).values('id')
auctions = Auctions.objects.filter(id__in = watchlist_id).all()

这里我们首先过滤 watchlist_id，然后在拍卖表中包含 (id__in)。