Question

以下是来自用户的三个请求geeting，create_node，rename_node运行正常，但delete_node请求未运行。

requests:
[31/Aug/2018 17:00:53] "GET /buildknowledge/?operation=create_node&id=1&text=New+node HTTP/1.1" 200 16071
[31/Aug/2018 17:01:10] "GET /buildknowledge/?operation=rename_node&id=63&text=pkkkk HTTP/1.1" 200 16071
[31/Aug/2018 17:02:33] "GET /buildknowledge/?operation=delete_node&id=63 HTTP/1.1" 200 16071

views.py：

def basetest(request):
     cu_id = request.user.id
     if 'operation' in request.GET and "id" in request.GET and "text" in request.GET:
       operation = request.GET['operation']
       pid=request.GET['id']
       nodename=request.GET['text']
       if "create_node" == operation:
          p=Buildkb4.objects.create    (parent=pid,created_by=cu_id,text=nodename)
          p.save()
       elif "delete_node" == operation:
           Buildkb4.objects.filter(pk=pid).delete()
       elif "rename_node" == operation:
           Buildkb4.objects.filter(pk=pid).update(text=nodename)
   return render(request,"registration/basetest.html")

Answer 1

注意：使用GET请求执行副作用（例如更新或删除数据库中的记录）不是一个好主意。因此，我建议将此类请求更改为POST，DELETE或PATCH。更多信息在这篇文章的底部。

根据显示的日志，删除调用在 querystring 中带有两个参数：operation和id。但是第一个if语句也需要一个text参数：

def basetest(request):
     cu_id = request.user.id
     if 'operation' in request.GET and "id" in request.GET and "text" in request.GET:
       operation = request.GET['operation']
       pid=request.GET['id']
       nodename=request.GET['text']
       if "create_node" == operation:
          p=Buildkb4.objects.create    (parent=pid,created_by=cu_id,text=nodename)
          p.save()
       elif "delete_node" == operation:
           Buildkb4.objects.filter(pk=pid).delete()
       elif "rename_node" == operation:
           Buildkb4.objects.filter(pk=pid).update(text=nodename)
   return render(request,"registration/basetest.html")

所以这永远不会达到elif "delete_node" == operation:的情况。

您可以通过减少检查的限制来解决此问题，例如：

def basetest(request):
     cu_id = request.user.id
     if 'operation' in request.GET and "id" in request.GET:
       operation = request.GET['operation']
       pid=request.GET['id']
       if "delete_node" == operation:
           Buildkb4.objects.filter(pk=pid).delete()
       elif 'text' in request.GET:
           nodename=request.GET['text']
           if "create_node" == operation:
               p=Buildkb4.objects.create(parent=pid,created_by=cu_id,text=nodename)
           elif "rename_node" == operation:
               Buildkb4.objects.filter(pk=pid).update(text=nodename)
   return render(request,"registration/basetest.html")

现在它可以工作了。但是，GET应该没有没有的副作用。因此，您基本上违反了GET请求的合同。

通常，删除是通过POST或DELETE请求执行的，而不是通过GET请求进行的。更改数据也由POST或PATCH请求处理，再次由GET请求处理。通过发出带有副作用的GET请求，机器人（例如搜索引擎）可能会查询URL，并删除和/或更新您的数据。这可能不是您想要的。

我不明白，为什么只有delete_node不起作用

1 个答案: