如何将这些循环转换为精细优化的Django查询

你能帮我优化这个视图吗？完成这项工作需要30多分钟。 我认为问题出在Django查询中。cSomeone建议我将所有查询
放在列表或字典中 我试过了，但我不知道如何推断Django查询

下面是节点和边模型

class Edge(models.Model):
    geometry = models.LineStringField(null=True)
    name = models.CharField(max_length=200, blank=False)
    target = models.ForeignKey(Node, on_delete=models.CASCADE)
    source = models.ForeignKey(Node, on_delete=models.CASCADE)
    network = models.ForeignKey(RoadNetWork, 
                                 on_delete=models.CASCADE)
    road_type = models.ForeignKey(RoadType, 
                                    on_delete=models.CASCADE)


class Node(models.Model):
    network = models.ForeignKey(RoadNetWork, 
                         on_delete=models.CASCADE)
    node_id = models.BigIntegerField()
    name = models.CharField('Node Name', max_length=200)
                         location = models.PointField()

---

target\u node\u instance

和

source\u node\u instance

用于什么？只需删除这两行，然后按目标和源将过滤器移动到下面的行。也不清楚

网络id

过滤器应该做什么。您只需按主键获取一个节点实例，然后从包含主键的同一实例获取属性，并再次使用相同的键筛选相同的模型？出于什么原因？您可以包括您的

节点

和

边缘

类定义吗？@IvanStarostin target_Node_实例和source_Node_实例允许我获取网络id和节点_id@Brad我只是添加了节点和边缘模型。请帮帮我！问题是try块中的代码

def upload_edge(request, pk):

    template = "networks/edge.html"

    roadnetwork = RoadNetWork.objects.get(id=pk)
    road_type = RoadType.objects.get(pk=2)
    _node_instance_ = Node.objects.select_related('network').filter(network_id=pk)

    if request.method == 'POST':
        form = EdgeForm(request.POST, request.FILES)
        if form.is_valid():

            datafile = request.FILES['my_file']      
            objects = json.load(datafile) 
            L=[]
            for object in objects['features']:
                objet_type = object['geometry']['type']
                if objet_type == 'LineString':
                    properties = object['properties']
                    geometry = object['geometry']

                    point1 = geometry['coordinates'][0]
                    point2 = geometry['coordinates'][1]

                    location = GEOSGeometry(
                        LineString(geometry['coordinates']))

                    target = properties.get('target')
                    source = properties.get('source')
                    name = properties.get('name')
               
                    try:
                        target = _node_instance_.get(node_id=target)
                        source = _node_instance_.get(node_id=source)

                        node = Edge(
                                geometry=location,
                                road_type=road_type,
                                target=target,
                                source=source,
                                network=roadnetwork)
                        L.append(node)
                    except:
                        pass

            Edge.objects.bulk_create(L)

        return redirect('home')
    else:
        form = EdgeForm()
        return render(request, template, {'form': form})