code: def _get_related_name(self):
          
          related_name = self.related_name or '%(model)s_set'
          related_name = related_name % {
              'namespace': re_identifier.sub('_', self._model.namespace),
              'model': self._model.__name__
          }
          if re_identifier.sub('', related_name) != related_name:
              raise ImplementationError('The related_name "%s" is not a valid '
                                        'python identifier' % related_name)
  
          return related_name.lower()
docs: Return the related name to use to access this related field.
          If the related_name argument is not defined in its declaration,
          a new one will be computed following this format: '%s_set' with %s the
          name of the model owning the related.field.
          If the related_name argument exists, it can be the exact name to use (
          be careful to use a valid python attribute name), or a string where you
          can set placeholder for the namespace and the model of the current
          model. It's useful if the current model is abstract with many subclasses
  
          Exemples:
              class Base(RelatedModel):
                  abstract = True
                  namespace = 'project'
                  a_field = FKStringField('Other', related_name='%(namespace)s_%(model)s_related')
                      # => related names accessible from Other are
                      #    "project_childa_related" and "project_childb_related"
  
              class ChildA(Base):
                  pass
  
              class ChildB(Base):
                  pass
  
              class Other(RelatedModel):
                  namespace = 'project'
                  field_a = FKStringField(ChildA)
                      # => related name accessible from ChildA and ChildB will be "other_related"
                  field_b = FKStringField(ChildB, related_name='some_others')
                      # => related name accessible from ChildA and ChildB will be "some_others"