851             else:

   851             else:

   852                 value.difference_update(self.mask[keyword])

   852                 value.difference_update(self.mask[keyword])

   853             

   853             

   854         return value.pop()

   854         return value.pop()

   855     

   855     

   856     def set_hash(self):

   859     def set_hash(self):

   857         try:

   860         try:

   858             self.id_hash = generate_hash(self.__unicode__())

   861             self.id_hash = generate_hash(self.__unicode__())

   859         except AttributeError:

   862         except AttributeError:

   860             self.id_hash = None

   863             self.id_hash = None

   865             unicode(self.iri_id if self.iri_id is not None else ""),

   868             unicode(self.iri_id if self.iri_id is not None else ""),

   866             unicode(self.ensemble_id if self.ensemble_id is not None else ""),

   869             unicode(self.ensemble_id if self.ensemble_id is not None else ""),

   867             unicode(self.cutting_id if self.cutting_id is not None else ""),

   870             unicode(self.cutting_id if self.cutting_id is not None else ""),

   868             unicode(self.element_id if self.element_id is not None else "")

   871             unicode(self.element_id if self.element_id is not None else "")

   869             ))

   872             ))

   871     def save(self, *args, **kwargs):

   874     def save(self, *args, **kwargs):

   872         self.set_hash()                

   875         self.set_hash()                

   873         super(Segment, self).save(*args, **kwargs)

   876         super(Segment, self).save(*args, **kwargs)

   874     

   877     

   875     

   878