Return the name for the current dynamic field, accepting a limpyd
        instance for the dynamic part

def get_name_for(self, dynamic_part):
        """
        Return the name for the current dynamic field, accepting a limpyd
        instance for the dynamic part
        """
        dynamic_part = self.from_python(dynamic_part)
        return super(DynamicRelatedFieldMixin, self).get_name_for(dynamic_part)