prevented "server" field on MumbleUser model from being changed once the record has been entered into the database (and hence into murmur). fixes #2

pyweb/mumble/models.py

@@ -272,7 +272,12 @@ class MumbleUser( models.Model ):
 		murmur = self.server.getDbusObject();
 		murmur.unregisterPlayer( dbus.Int32( self.mumbleid ) );
 	
+	def __setattr__( self, name, value ):
+		if name == 'server':
+			if self.id is not None and self.server != value:
+				raise AttributeError( "This field must not be updated once the Record has been saved." );
 		
+		models.Model.__setattr__( self, name, value );
 
 
 from django.db.models import signals