octobercms/october · error · ApplicationException

The relationship morphTo is not supported for list columns.

Error message

The relationship morphTo is not supported for list columns.

What it means

Error "The relationship morphTo is not supported for list columns." thrown in octobercms/october.

Source

Thrown at modules/backend/widgets/Lists.php:516

            }

            // Allow extensions inside the search grouping
            $this->fireSystemEvent('backend.list.extendSearchQuery', [$innerQuery]);
        });

        // Custom select queries
        foreach ($this->getVisibleColumns() as $column) {
            if (!$column->sqlSelect) {
                continue;
            }

            $alias = $query->getQuery()->getGrammar()->wrap($column->columnName);

            // Relation column
            if ($column->relation) {
                $relationType = $this->model->getRelationType($column->relation);
                if ($relationType === 'morphTo') {
                    throw new ApplicationException('The relationship morphTo is not supported for list columns.');
                }

                $table = $this->model->makeRelation($column->relation)->getTable();
                $sqlSelect = $this->parseTableName($column->sqlSelect, $table);

                // Manipulate a count query for the sub query
                $relationObj = $this->model->{$column->relation}();
                $relationQuery = $relationObj->getRelated()->newQuery();

                // Apply related constraints to the sub query
                // Possibility: the column could contribute to this via conditions or scope
                $relationObj->addDefinedConstraintsToQuery($relationQuery);

                $countQuery = $relationObj->getRelationExistenceQuery($relationQuery, $query);

                $isMultiRelation = $this->isColumnRelated($column, true);

                $joinSql = $isMultiRelation

View on GitHub (pinned to b608633a7e)

When it happens

Trigger: Thrown at modules/backend/widgets/Lists.php:516 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/2bcaf9af2dc96aa8. Report an issue: GitHub.