使用 django 过滤器时无法解析关键字

Question

当我按日期过滤 csv 输出时出现此错误。我还想问一下如何将上个月或过去 6 个月的数据输出到 csv？因为我只有current_month & current_year 谢谢！

Cannot resolve keyword 'created_at' into field. Choices are: amount, id, level, report, timestamp

@models.py

class Rainfall(models.Model):
    level = models.CharField(max_length=10, blank=True, default='')
    amount = models.FloatField()
    timestamp = models.DateTimeField(auto_now_add=True)

@views.py

def export_by_month(request):
    response = HttpResponse(content_type='text/csv')
    current_month = datetime.now()

    writer = csv.writer(response)
    writer.writerow(['Level', 'Amount', 'Timestamp'])

    for i in Rainfall.objects.filter(created_at__month=current_month):
        writer.writerow(i)

    response['Content-Disposition'] = 'attachment; filename="rainfall.csv"'


def export_by_year(request):
    current_year = datetime.now().year
    return Rainfall.objects.filter(created_at__year=current_year)

Answer 1

您的Rainfall 模型没有created_at 属性。也许这就是你想要的：

Rainfall.objects.filter(timestamp__month=current_month)