***** want to share a pool of IP Addresses which are unique for both
model Plc and model Station. Want to use Admin for adding Plc's and
Stations. As is, if I try to use an IP address used within model PLC
for another PLC it fails validation as expected. If I try to use an IP
address assigned to a PLC in a new Station record, no error is
displayed. I want a way to do this within the database design. I can
do it as shown below for the station but don't know how to raise a
native Admin error. The error shows up as a server error. Help
class Ip_addresses(models.Model):
ip_addr=models.IPAddressField(unique=True)
def __str__(self):
return self.ip_addr
class Plc(models.Model):
name=models.CharField(max_length=30,unique=True)
ip_addr=models.OneToOneField(Ip_addresses)
#IPAddressField()
ip_port=models.IntegerField(default=9600)
plc_net=models.IntegerField(default=0)
plc_node=models.IntegerField()
plc_unit=models.IntegerField(default=0)
def __unicode__(self):
return self.name
class Admin: pass
class Station(models.Model):
DEV_TYPE=(
('friend','friend'),
('user','user'),
('peer','peer'))
HOST_TYPE=(
('static','static'),
('dynamic','dynamic'))
DTMF_MODE=(
('rfc2833','rfc2833'),
('inband','inband'))
dev_name=models.CharField(max_length=30,unique=True)
dev_type=models.CharField
(max_length=30,choices=DEV_TYPE,default='friend')
ip_addr=models.OneToOneField(Ip_addresses)
#IPAddressField()
host=models.CharField
(max_length=20,choices=HOST_TYPE,default='static')
secret=models.CharField(max_length=20,default='1234')
dtmf_mode=models.CharField
(max_length=20,choices=DTMF_MODE,default='rfc2833')
mailbox=models.CharField(max_length=40,default='0')
context=models.CharField(max_length=40)
callerid=models.CharField(max_length=80)
def __str__(self):
return self.dev_name
def save(self):
from extensions.models import Plc
from django.http import HttpResponse
try:
p=Plc.objects.get(ip_addr=self.ip_addr)
except ObjectDoesNotExist:
self.context=self.dev_name
super(Station,self).save()
else:
raise Exception("IP Address used by PLC")
class Admin: pass
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