lib/components/db/behaviors/RelatedObjects.php
public function beforeSave($event)
    {
        foreach ($this->_relations as $key => $relation) {
            unset($relation['_moduleHandler']);
            if (!empty($this->companionObject)) {
                if ($this->companionRole === 'child') {
                    $relation['parent_object_id'] = $this->companionObject->primaryKey;
                } else {
                    $relation['child_object_id'] = $this->companionObject->primaryKey;
                }
            }
            if (empty($relation['child_object_id']) && empty($relation['parent_object_id'])) {
                if (!empty($this->_relations) && (!$this->companionObject || empty($this->companionObject->primaryKey))) {
                    $event->isValid = false;
                    $this->owner->addError('_', 'Saving relations with no companion object! ' . get_class($this->owner));

                    return false;
                }
            }
            $this->owner->registerRelationModel($relation, $key);
        }
    }
public function beforeSave($event)
    {
        foreach ($this->_relations as $key => $relation) {
            unset($relation['_moduleHandler']);
            if (!empty($this->companionObject)) {
                if ($this->companionRole === 'child') {
                    $relation['parent_object_id'] = $this->companionObject->primaryKey;
                } else {
                    $relation['child_object_id'] = $this->companionObject->primaryKey;
                }
            }
            if (empty($relation['child_object_id']) && empty($relation['parent_object_id'])) {
                if (!empty($this->_relations) && (!$this->companionObject || empty($this->companionObject->primaryKey))) {
                    $event->isValid = false;
                    $this->owner->addError('_', 'Saving relations with no companion object! ' . get_class($this->owner));

                    return false;
                }
            }
            $this->owner->registerRelationModel($relation, $key);
        }
    }
[[@doctodo method_description:beforeSave]].

@param [[@doctodo param_type:event]] $event [[@doctodo param_description:event]]

@return [[@doctodo return_type:beforeSave]] [[@doctodo return_description:beforeSave]]