django模型 - 繼承模型之間的關係？

Question

我正在研究服務器/數據中心庫存管理工具。我有一個類來定義默認的「設備」，然後用它來表示自定義設備（Linux服務器，Windows服務器，路由器，交換機等）

我也有數據模型設置爲表示IP地址一個網絡。

我的問題是，什麼是表達所有各種設備模型和ipv4地址模型之間關係的最佳方式？

class device(models.Model): 
    '''the primary object. all types of networked devices are based on and inherit this class''' 
    STATUS_CHOICES = (('0', 'unknown'),('1','active'),('2','pending'),('3','inactive'),('4', 'inventory'),('5','mothballed'),('6','surplus'),) 

    '''technical information''' 
    hostname = models.CharField(max_length=45, unique=True, db_index=True, help_text="The published hostname for this device") 

    '''misc. information''' 
    description = models.TextField(blank=True, null=True, help_text="A free-form description field") 

    type = models.ForeignKey(deviceStatus, help_text="The classification for this device") 
    status = models.IntegerField(choices=STATUS_CHOICES, help_text="current status of device") 
    is_monitored = models.BooleanField(default=True, help_text="is the device monitored?") 
    date_added = models.DateTimeField(auto_now=True, help_text="Date and Time device is entered into Barrelhouse", editable=False) 
    warranty_expriry = models.DateField(help_text="Date Manufacturer warranty expires") 
    extended_warranty = models.BooleanField(help_text="Whether or not device has some extended warranty in addition to the manufacturer",default=False, validators=[validate_extended_warr]) 
    ext_warranty_expiry = models.DateField(help_text="Date Extended Warranty Expires", null=True) 
    account = models.ForeignKey(vendorAccount, help_text="account associated with this device") 

    class Meta: 
      abstract = True 

class deviceLinuxSystem(device): 
    '''a typcial linux system --- you can get as specific as you want to in various server and desktop types.''' 
    ip_address = generic.GenericRelation(ipv4address) 

    def get_absolute_url(self): 
      return "linux_devices/%i/" % self.id 

    def __unicode__(self): 
      return self.hostname 

    class Meta: 
      verbose_name = "Linux System" 
class deviceWindowsSystem(device): 
    '''a typical windws system''' 

    def get_absolute_url(self): 
      return "windows_devices/%i/" % self.id 

    def __unicode__(self): 
      return self.hostname 

    class Meta: 
      verbose_name = "Windows System" 


class ipv4address(models.Model): 
    '''a model to represent all used IPv4 addresses on networks''' 
    netIP = models.IPAddressField(help_text="associated address", verbose_name="IP Address", unique=True, db_index=True) 
    network = models.ForeignKey(network, help_text="Network this IP lives on") 

Answer 1

手頭關注的問題是：

My question is, what would be the best way to express the relationship between all of the various device models and the ipv4 address model?

我建議增加dev = models.ForeignKey(device, related_name="address")（也可能是portNumber = models.PositiveSmallIntegerField(default=0)）到ipv4address。一個設備可以有多個網絡端口，因此可以有多個IP地址，除非你有一些東西強制執行一個地址去主機而不管端口（例如有線或無線）。

如果你保證每個主機只有一個地址，那麼你應該想要dev = models.OneToOneField(device, related_name="address")。