Question

我有三种型号：

class Target(models.Model):
    fqdn = models.CharField(max_length=100)
    ports = models.ManyToManyField('Port')

class Port(models.Model):
    status = models.CharField(max_length=20)
    services = models.ManyToManyField('Service')

class Service(models.Model):
    name = models.CharField(max_length=200)
    vuls = models.ManyToManyField('Vul')

class Vul(models.Model):
    code = models.CharField(max_length=100)
    name = models.CharField(max_length=200)

和一个模板，我要在其中计算特定目标的目标：

{% for t in targets %}
Target: {{ t.fqdn }}
Count Vuls: {{ t.ports.services.vuls.count }}
{% endfor %}

如果我计算端口：

t.ports.count

没有问题... 但是，如何计算“超过”多个关系呢？

Answer 1

我认为有一个“解决方案” ...

class Target(models.Model):
    fqdn = models.CharField(max_length=100)
    ports = models.ManyToManyField('Port')
    #counts vuls for every target
    def getSumVuls(self):
        sum = 0
        for p in ports.all():
            for s in p.services.all():
                sum = sum + s.vuls.count()
        return sum

class Port(models.Model):
    status = models.CharField(max_length=20)
    services = models.ManyToManyField('Service')

class Service(models.Model):
    name = models.CharField(max_length=200)
    vuls = models.ManyToManyField('Vul')

class Vul(models.Model):
    code = models.CharField(max_length=100)
    name = models.CharField(max_length=200)

在模板中，我将调用getSumVuls（）方法：

{% for t in targets %}
Target: {{ t.fqdn }}
Count Vuls: {{ t.getSumVuls }}
{% endfor %}

我对这种“解决方案”并不满意……我认为性能是一个问题！？！？

计算模板中的三个（或更多）多对多关系

1 个答案: