model.relation.beforeAttach

Triggered in October\Rain\Database\Relations\BelongsToMany.

Called before creating a new relation between models (only for BelongsToMany relation)

Example usage:

$model->bindEvent('model.relation.beforeAttach', function (string $relationName, mixed $id, array $insertData) use (\October\Rain\Database\Model $model) {
    if (!$model->isRelationValid($id)) {
        return false;
    }
});