code: def bind_name(self, name):
          
          if self.name:
              raise errors.Error('Already bound "{0}" with name "{1}" could not '
                                 'be rebound'.format(self, self.name))
          self.name = name
          self.storage_name = ''.join(('_', self.name))
          return self
docs: Bind field to its name in model class.