hasAssociationWithStorageName example

if ($field instanceof ReferenceVersionField) {
                    $fields->add($field);

                    continue;
                }

                if (!$field instanceof FkField) {
                    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);
        }