code: def remove_prefix(self, id):
          
  
          if 'prefix' not in request.params:
              abort(400, 'Missing prefix.')
          prefix = Prefix.get(int(request.params['prefix']))
          prefix.pool = None
          prefix.save()
  
          redirect(url(controller = 'pool', action = 'edit', id = id))
docs: Remove a prefix from pool 'id'.