Question

我有以下型号：

class Announcement(models.Model):
    name = models.CharField(max_length=500)
    content = models.CharField(max_length=1000)
    is_active = models.BooleanField(default=False)
    date_start = models.DateTimeField()
    date_end = models.DateTimeField()

    def __str__(self):
        return self.name

我可以过滤is_active字段上的对象，例如：

def announcements(request):
    announcements = Announcement.objects.all().filter(
        is_active = True
    )
    return HttpResponse(
        serializers.serialize("json", announcements))

这很好用。但是，当我想根据date_start字段过滤它们时，这样：

def announcements(request):
    announcements = Announcement.objects.all().filter(
        date_start >= datetime.now()
    )
    return HttpResponse(
        serializers.serialize("json", announcements))

我收到global name 'date_start' is not defined错误。

Answer 1

您需要使用queryset过滤器查找__gte (greater than or equal)：

announcements = Announcement.objects.all().filter(date_start__gte = datetime.now())

Answer 2

这种语法错误：

announcements = Announcement.objects.all().filter(date_start >= datetime.now())

filter需要Python关键字参数。所以实际上你可以：

announcements = Announcement.objects.all().filter(date_start__gte=datetime.now())

有关Django docs: Making queries: Field lookups的详情。

如何在datetime字段上过滤对象？

2 个答案: