django ORM 一对多， 多对多 查询 以及 结合Tamplate

ORM 表结构；和管理员是多对多， 和 OS 是一对多

class hosts(models.Model):
    out_ip=models.CharField(max_length=32)
    in_ip=models.CharField(max_length=32)
    app=models.ForeignKey(App)
    login_user=models.CharField(max_length=32)
    login_pwd=models.CharField(max_length=32)
    os=models.ForeignKey(Os)
    host_class=models.ForeignKey(Host_Class)
    # admins=models.ForeignKey(Admins)
    admins = models.ManyToManyField(Admins)
    disk=models.IntegerField()
    network=models.IntegerField()
    desc=models.CharField(max_length=100,null=True)

class Os(models.Model):
    name=models.CharField(max_length=32)
#所属管理员
class Admins(models.Model):
    name=models.CharField(max_length=32)
    def __str__(self):
        return self.name

一对多：

Python中查询:

all_data=hosts.objects.all()
for i in all_data:
    print(i.os.name)　　-->查询出主机所对应的 系统名称

再Tamplate中

all_data=hosts.objects.all()

return render(req,'hosts_index.html',locals())

{% for obj in all_data %}

    <div class="c7 ca jg">{{ obj.os.name }}</div>

{% endfor %}



===========多对多:
Python中查询:

all_data=hosts.objects.all()
for i in all_data:
    for p in i.admins.all():
        print(p)

再Tamplate中

all_data=hosts.objects.all()

return render(req,'hosts_index.html',locals())

{% for obj in all_data %}

<div class="c4 ca jg">

     {% for i in obj.admins.all %}
            {{ i }}
     {% endfor %}
</div>

{% endfor %}