126   def constructKeyNameSuffix(self, fields):

   127     """Constructs a suffix from the specified fields

   128 

   129     The resulting suffix is constructed by adding a '/' after all

   130     key fields. The suffix is constructed in the order as specified

   131     in the model's key_fields property. The suffix will not have a

   132     trailing '/'.

   133 

   134     Args:

   135       fields: a dictionary with the values for all the key_fields

   136           of this entity.

   137     """

   138 

   139     suffix = ''

   140 

   141     for field in self._model.key_fields:

   142       suffix += fields[field]

   143       suffix += '/'

   144 

   145     if suffix.endswith('/'):

   146       suffix = suffix[:-1]

   147 

   148     return suffix

   149 

   150   def getEmptyKeyFields(self):

   151     """Returns an dict with all the entities key_fields set to None

   152     """

   153 

   154     kwargs = {}

   155 

   156     for field in self._model.key_fields:

   157       kwargs[field] = None

   158 

   159     return kwargs

   160