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I want to add created_at and updated_at columns in a custom table and update both columns on saving the data.

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Follow below steps to update the created_at and update_at columns on saving the data in the table.

  1. Create created_at and update_at columns in the database table.

................. <column xsi:type="timestamp" name="created_at" on_update="false" nullable="false" default="CURRENT_TIMESTAMP" comment="Creation Time"/> <column xsi:type="timestamp" name="updated_at" on_update="true" nullable="false" default="CURRENT_TIMESTAMP" comment="Update Time"/> .................

  1. Update the Model/CustomTable.php file to add beforeSave() function.
use Magento\Framework\Api\DataObjectHelper;
class CustomTable extends \Magento\Framework\Model\AbstractModel
{
    /**
     * @var \Magento\Framework\Stdlib\DateTime
     */
    private $dateTime;

    public function __construct(
        \Magento\Framework\Model\Context $context,
        \Magento\Framework\Registry $registry,
        \Magento\Framework\Stdlib\DateTime $dateTime,
        DataObjectHelper $dataObjectHelper,
        array $data = []
    ) {
        $this->dateTime = $dateTime;
        $this->dataObjectHelper = $dataObjectHelper;
        parent::__construct(....);
    }

    /**
     * Prepare data to be saved to database.
     *
     * @return $this
     */
    public function beforeSave()
    {
        parent::beforeSave();
        if ($this->isObjectNew() && !$this->getCreatedAt()) {
            $this->setCreatedAt($this->dateTime->formatDate(true));
        }
        $this->setUpdatedAt($this->dateTime->formatDate(true));

        return $this;
    }
}

Hope this works for you.

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