I know you can set config data in Magento 1 with:

Mage::getModel('core/config')->saveConfig('my/path/whatever', $value);

and you can get config data in Magento 2 with:

protected $_scopeConfig

public function __construct(\Magento\Framework\App\Config\ScopeConfigInterface $scopeConfig) {
    $this->_scopeConfig = $scopeConfig;


$this->_scopeConfig->getValue( 'path/of/config', \Magento\Store\Model\ScopeInterface::SCOPE_STORE );

But I can't figure out, how I can save config data in Magento 2


This is how you should save data in magento2 core_config_data

    use Magento\Framework\App\Config\ScopeConfigInterface;

     *  @var \Magento\Framework\App\Config\Storage\WriterInterface
    protected $configWriter;

     * @param \Magento\Framework\App\Config\Storage\WriterInterface $configWriter
    public function __construct(
        \Magento\Framework\App\Config\Storage\WriterInterface $configWriter
        $this->configWriter = $configWriter;

add below line in your calling method :

$this->configWriter->save('my/path/whatever',  $value, $scope = ScopeConfigInterface::SCOPE_TYPE_DEFAULT, $scopeId = 0);

You can Inject ConfigInterface class and use it to save the value.

protected $_configInterface;

public function __construct(
    \Magento\Framework\App\Config\ConfigResource\ConfigInterface $configInterface
) {
    $this->_configInterface = $configInterface;

Then you can use it in your method like

    ->saveConfig('section/group/field', $value, 'default', 0);
  • 1
    Do not do this except you are sure your paths don't need to be trimmed. It is recommended to use the configWriter – Chuvisco Apr 9 '18 at 12:55

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