Fix Error: Notice: Array to string conversion

Problem

The site is using the Amasty Product Feed extension. If you set the Schedule and trying to save feed profiles:

Unable to save feed with ID xx. Error: Notice: Array to string conversion in /magento_dir/vendor/magento/framework/DB/Adapter/Pdo/Mysql.php on line 3105

My environment:

• PHP 7.2
• Magento 2.3.3
• Amasty Product Feed 2.5.1

Temporary solution

Although I updated the extension to the latest version, the error is still there. After debugged the extension, I figure out that it’s trying to store cron_day & cron_time values into DB with longtext type.

I have to modify app/code/Amasty/Feed/Controller/Adminhtml/Feed/Save.php, this is a temporary solution because the modified part may be overwritten by a new update. But it works.

The point is to remove unnecessary data when it saving the Feed Model. I added this function:

/**
 * Get schedule data & remove them from data
 * to preven Array to String conversion error
 *
 * @param $data
 * @return array
 */
private function getScheduleData(&$data) {
    $scheduleData = $data;
    if (isset($data[ScheduleInterface::CRON_DAY])) {
        unset($data[ScheduleInterface::CRON_DAY]);
    }

    if (isset($data[ScheduleInterface::CRON_TIME])) {
        unset($data[ScheduleInterface::CRON_TIME]);
    }
    
    return $scheduleData;
}

This is how I use the function above:

$scheduleData = $this->getScheduleData($data);
$model->setData($data);

$this->_session->setPageData($model->getData());

$this->feedRepository->save($model, true);

$this->scheduleManagement->saveScheduleData($model->getEntityId(), $scheduleData);

The Gist of the modified file: app/code/Amasty/Feed/Controller/Adminhtml/Feed/Save.php.