how to cancel a delete in django signal -

is there way cancel deletion of record using django pre_delete signal?

example:

def on_delete(sender,**kwargs):   if not <some condition>:     #cancel deletion  # else continue deletion pre_delete.connect(on_delete,sender=mymodel) 

and question there way model "that before changing file delete first original file" because right do(see code below) , i'm not sure if best way it.

def on_save(sender,**kwargs):   obj = kwargs['instance']   try:     id = obj.pk     # find file     original_file = sender.objects.get(pk=id)     # delete original file before uploading new file     original_file.file.delete()   except ....  pre_save.connect(on_save,sender=modelwithfileupload) 

(in django 1.2 automatically delete file on change or on delete in django 1.3 removed feature)

thanks in advance

i try little hack workaround:

def on_delete(sender,**kwargs):   if not <some condition>:     raise exception('do not delete')#cancel deletion  # else continue deletion pre_delete.connect(on_delete,sender=mymodel) 

and view

def on_save(sender,**kwargs):   obj = kwargs['instance']   try:     id = obj.pk     # find file     original_file = sender.objects.get(pk=id)     # delete original file before uploading new file   except ... :     # oder exceptions     try:     original_file.file.delete()   except:     pass #not deleted  pre_save.connect(on_save,sender=modelwithfileupload) 

raising exception in signal should brake delete() method execution while returning exception place invoked. create own exception subclass except type of exception (you never should use except no args).