source: django_apps/wndb/admin.py@ 403

from wndb.models import *
from django.contrib import admin
from django.db.models import get_models, get_app
from django.contrib.admin.sites import AlreadyRegistered
from django import forms
from django.db.models import Q

class InterfaceInline(admin.TabularInline):
  extra = 3
  model = Interface

class NodeAdmin(admin.ModelAdmin):
  inlines = [
    InterfaceInline,
  ]

admin.site.register(Node,NodeAdmin)

class LinkForm(forms.ModelForm):
  def __init__(self, *args, **kwargs):
    super(LinkForm, self).__init__(*args, **kwargs)
    if 'initial' in kwargs:
      self.fields['ip_block'].queryset = IPBlock.objects.filter(Q(link__isnull=True))
    else:
      self.fields['ip_block'].queryset = IPBlock.objects.filter(Q(link__isnull=True)|Q(pk=self.instance.ip_block.id))

class LinkAdmin(admin.ModelAdmin):
  form = LinkForm

admin.site.register(Link,LinkAdmin)


for model in get_models(get_app('wndb')):
  try:
    admin.site.register(model)
  except AlreadyRegistered:
    pass