fix block edit

issues:
1. IPAddressField is deprecated. We can change this without consequence
because the underlying field type is not changed.
2. New admin was not wired up.
3. There was a admin bug when one end of the block is zero.

libraryauth/admin.py

@@ -5,7 +5,7 @@ from selectable.base import ModelLookup
 from selectable.registry import registry
 
 from django import forms
-from django.contrib.admin import ModelAdmin
+from django.contrib.admin import ModelAdmin, site
 from django.contrib.auth.models import User, Group
 
 class UserLookup(ModelLookup):
@@ -47,3 +47,8 @@ class CardPatternAdmin(ModelAdmin):
 class EmailPatternAdmin(ModelAdmin):
     list_display = ('library', 'pattern', )
     search_fields = ('library__name',)
+
+site.register(models.Library, LibraryAdmin)
+site.register(models.Block, BlockAdmin)
+site.register(models.CardPattern, CardPatternAdmin)
+site.register(models.EmailPattern, EmailPatternAdmin)

libraryauth/models.py

@@ -140,7 +140,7 @@ class IP(object):
         if not isinstance(other, IP):
             other = IP(other)
 
-        if self.int and other.int:
+        if self.int is not None and other.int is not None:
             return self.int.__cmp__(other.int)
 
         raise ValueError('Invalid arguments')
@@ -177,7 +177,7 @@ class IPAddressFormField(BaseIPAddressField):
             raise ValidationError(self.default_error_messages['invalid'],
                                   code='invalid')
 
-class IPAddressModelField(models.IPAddressField):
+class IPAddressModelField(models.GenericIPAddressField):
     __metaclass__ = models.SubfieldBase
     empty_strings_allowed = False
 
@@ -205,10 +205,10 @@ class IPAddressModelField(models.IPAddressField):
     def formfield(self, **kwargs):
         defaults = {'form_class': IPAddressFormField}
         defaults.update(kwargs)
-        return super(models.IPAddressField, self).formfield(**defaults)
+        return super(models.GenericIPAddressField, self).formfield(**defaults)
         
     def deconstruct(self):
-        name, path, args, kwargs = super(models.IPAddressField, self).deconstruct()
+        name, path, args, kwargs = super(models.GenericIPAddressField, self).deconstruct()
         return name, path, args, kwargs
 
 class Block(models.Model):