Jarves\Storage\Propel::extractSelection PHP Method

    public function extractSelection($fields)
    {
        foreach ($fields as $fieldKey) {
            if ($field = $this->getDefinition()->getField($fieldKey)) {
                if ($fieldType = $field->getFieldType()) {
                    foreach ($fieldType->getSelection() as $selection) {
                        $fields[] = $selection;
                    }
                }
            }
        }
        return $fields;
    }