model.relation.beforeAttach

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

Example usage:

$model->bindEvent('model.relation.beforeAttach', function (string $relationName, array $attachedIdList, array $insertData) use (\Winter\Storm\Database\Model $model) {
    if (!$model->isRelationValid($attachedIdList)) {
        throw new \Exception("Invalid relation!");
        return false;
    }
});

NOTE: If a custom pivotModel is being used the parameters will actually be string $relationName, mixed $id, array $attributes