尽管对象有效,但在包含查询集时,视图返回404

时间:2017-01-02 15:35:38

标签: django django-views

我使用以下网址格式将模型的主键传递给下面详细介绍的视图类。相关模型的主键" Host"是有效的IP地址或FQDN。

网址格式:

ValidIpAddressRegex = "(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"
ValidHostnameRegex = "(([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z0-9]|[A-Za-z0-9][A-Za-z0-9\-]*[A-Za-z0-9])"

url(r"^host/(?P<pk>({}|{}))/$".format(ValidIpAddressRegex, ValidHostnameRegex),
    views.HostView.as_view(),
    name="host")

查看课程:

class HostView(generic.DetailView):
    model = Host
    template_name = 'report_viewer/host.html'
    context_object_name = 'related_findings'

    def get_queryset(self):
        """Return all related findings"""
        host = get_object_or_404(Host, name=self.kwargs["pk"])
        return host.get_findings()  # A function on the model to return related records from another model

相关模板:

<ul>
    {% for finding in related_findings %}
      <li><a href="{% url 'report_viewer:finding' finding.plugin_id %}"><strong>{{ finding.plugin_id }}</strong> {{ finding.plugin_name }}</a></li>
    {% empty %}
      <li>No findings!</li>
    {% endfor %}
</ul>

主机型号:

class Host(models.Model):
    name = models.CharField(max_length=255, primary_key=True)
    os_general = models.CharField(max_length=255, blank=True, verbose_name="Generic OS Identifier")
    os_specific = models.CharField(max_length=255, blank=True, verbose_name="Reported OS Name")
    ssh_fingerprint = models.CharField(max_length=255, blank=True, verbose_name="SSH Fingerprint")
    mac_address = models.CharField(max_length=17, blank=True, verbose_name="MAC Address")
    ip_address = models.GenericIPAddressField(blank=True, null=True, verbose_name="IP Address")
    fqdn = models.CharField(max_length=255, blank=True, verbose_name="Fully Qualified Domain Name")
    netbios_name = models.CharField(max_length=255, blank=True, verbose_name="NetBIOS Name")

    def __str__(self):
        return self.name

    def get_findings(self):
        findings = Finding.objects.filter(targets=self)
        return findings

    class Meta:
        ordering = ['name']

有效网址的结果是&#34;找不到匹配查询的搜索结果&#34;,由views.HostView引发。下面的视图成功运行,调用{%empty%}条件,这表明我正确地构造了get_object_or_404请求,或者可能是&#34; pk&#34;变量被破坏,并且不是有效密钥。

我很感激对解决方案的任何想法。或者确实是实现相同结果的另一种方法。

1 个答案:

答案 0 :(得分:0)

事实证明,解决方案比预期的要简单得多。我试图将get_queryset函数与通用DetailView一起使用,当它与ListView一起使用时。

我重写了模型以改为使用get_context_data函数。

class HostView(generic.DetailView):
    model = Host
    template_name = 'report_viewer/host.html'

    def get_context_data(self, **kwargs):
        """Return all related findings"""
        context = super(HostView, self).get_context_data(**kwargs)
        context['host'] = get_object_or_404(Host, name=self.kwargs["pk"])
        context['findings'] = context['host'].get_findings()
        return context

然后,我可以在模板中访问相关的主机模型及其所有相关的查找模型。