Question

如何过滤列表是否包含参数？

在我的Django-Rest-Framework项目中，我列出了physical_server：

  [
    {
        "id": 23,
        "name": 'A1'
        "ipv4s": [
            {
                "id": 313,
                "ip": "43.243.33.33",
                "netmask": "255.255.255.248",
                "prefix": 29,
                "is_gateway": false,
                "is_network_ip": false,
                "is_broadcast_ip": false,
                "desc": null,
                "ctime": "2018-04-26T21:17:34.868492+08:00",
                "uptime": "2018-05-21T12:09:25.674283+08:00",
       ....

这是我的列表API视图：

class PhysicalServerListAPIView(ListAPIView):
    serializer_class = PhysicalServerListSerializer
    permission_classes = [AllowAny]
    pagination_class = CommonPagination

    def get_queryset(self):
        query_params = self.request.query_params

        ip_address = ''
        try:
            ip_address = query_params.pop('ip_address')  # this maybe `43.243.33.33`
        except Exception as e:
            pass

        qs = PhysicalServer.objects.filter(xxxx)  # there I want the ip_address filtered if it in the `ipv4s`.

        return qs

如何实现此过滤器？因为它不是物理服务器的属性。我无法使用filter(name='xxx')来做到这一点。

修改-1

我知道我可以使用for循环来迭代查询集的ipv4s，但我不确定这是方便还是有效。

Answer 1

要按相关型号过滤服务器，请使用__ (docs)符号：

ip_address = query_params.pop('ip_address')
qs = PhysicalServer.objects.filter(ipv4s__ip=ip_address)

要使服务器ipv4s列表仅包含已过滤的ip使用prefetch_related：

from django.db.models import Prefetch
qs = PhysicalServer.objects.filter(ipv4s__ip=ip_address).prefetch_related(Prefetch('ipv4s', queryset=IPV4S.objects.filter(ip=ip_address))

现在，服务器ipv4s将仅显示已过滤的IP地址。

Answer 2

abount过滤器如何：

def get_queryset(self):
    query_params = self.request.query_params
    ip_address = ''
    try:
        ip_address = query_params.pop('ip_address')  
    except Exception as e:
        pass
    qs = PhysicalServer.objects.all()  
    if ip_address:
        qs = [p for p in qs if ip_address in [d['ip'] for d in p['ipv4s']]]
    return qs

如何过滤列表是否包含参数？

2 个答案: