getBaseFields example

throw new \Exception('Only AssociationFields, FkFields/ReferenceVersionFields for a ManyToOneAssociationField or fields flagged as Runtime can be added as Extension.');
                }

                if (!$this->hasAssociationWithStorageName($field->getStorageName(), $new)) {
                    throw new \Exception(sprintf('FkField %s has no configured OneToOneAssociationField or ManyToOneAssociationField in entity %s', $field->getPropertyName(), $this->className));
                }

                $fields->add($field);
            }
        }

        foreach ($this->getBaseFields() as $baseField) {
            $fields->add($baseField);
        }

        foreach ($fields as $field) {
            if ($field instanceof TranslationsAssociationField) {
                $this->translationField = $field;
                $fields->add(
                    (new JsonField('translated', 'translated'))->addFlags(new ApiAware(), new Computed(), new Runtime())
                );

                break;
            }