code: def get_prefix(self):
          
          for key, value in self.pages_config.items():
              if not hasattr(value, '__iter__'):
                  value = (value, )
              for item in value:
                  if type(self.node) == item\
                          or type(self.node) == getattr(item, 'model', None):
                      return key
docs: Each resource defined in config for pages as dict. This method
          returns key from config where located current resource.