octobercms/october · error · ApplicationException

backend::lang.model.missing_relation

Error message

backend::lang.model.missing_relation

What it means

Error "backend::lang.model.missing_relation" thrown in octobercms/october.

Source

Thrown at modules/backend/behaviors/RelationController.php:392

        // Configuration details
        if (!$this->relationHasField($field)) {
            throw new ApplicationException(Lang::get('backend::lang.relation.missing_definition', compact('field')));
        }

        $this->applyExtraConfig($field);
        $this->alias = camel_case('relation ' . HtmlHelper::nameToId($field));
        $this->config = $this->makeConfig($this->originalConfig->{$field}, $this->requiredRelationProperties);
        $this->controller->relationExtendConfig($this->config, $this->field, $this->model);
        $this->manageId = $this->getManageIdForField($field);
        $this->pivotId = post('pivot_id');
        $this->foreignId = post('foreign_id');
        [$this->sessionKey, $this->relationSessionKey] = $this->getSessionKeysForField($field);

        // Relationship details
        [$nestedModel, $nestedField] = $this->makeNestedRelationModel($this->model, $this->config->valueFrom ?? $field);
        if (!$nestedModel->hasRelation($nestedField)) {
            throw new ApplicationException(Lang::get('backend::lang.model.missing_relation', ['class' => get_class($nestedModel), 'relation' => $nestedField]));
        }

        $this->relationParent = $nestedModel;
        $this->relationName = $nestedField;
        $this->relationType = $nestedModel->getRelationType($nestedField);
        $this->relationObject = $nestedModel->{$nestedField}();
        $this->relationModel = $this->relationObject instanceof HasOneOrMany
            ? $this->relationObject->make()
            : $this->relationObject->getRelated();

        $this->readOnly = $this->getConfig('readOnly');
        $this->popupSize = $this->getConfig('popupSize', 950);
        $this->externalToolbarBus = $this->getConfig('externalToolbarBus');
        $this->eventTarget = $this->evalEventTarget();
        $this->deferredBinding = $this->evalDeferredBinding();
        $this->viewMode = $this->evalViewMode();
        $this->manageMode = $this->evalManageMode();
        $this->manageTitle = $this->evalManageTitle();

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/behaviors/RelationController.php:392 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of octobercms/october@b608633a7e (2026-08-21). Data as JSON: /api/errors/08d588e1af3919f9. Report an issue: GitHub.