code: def get(self, *args, **kwargs):
          
          self.before_get(args, kwargs)
  
          relationship_field, model_relationship_field, related_type_, related_id_field = self._get_relationship_data()
  
          obj, data = self._data_layer.get_relationship(model_relationship_field,
                                                        related_type_,
                                                        related_id_field,
                                                        kwargs)
  
          result = {'links': {'self': request.path,
                              'related': self.schema._declared_fields[relationship_field].get_related_url(obj)},
                    'data': data}
  
          qs = QSManager(request.args, self.schema)
          if qs.include:
              schema = compute_schema(self.schema, dict(), qs, qs.include)
  
              serialized_obj = schema.dump(obj)
              result['included'] = serialized_obj.data.get('included', dict())
  
          final_result = self.after_get(result)
  
          return final_result
docs: Get a relationship details