I have to change the type of an attribute from text to decimal. I used upgrade script below. But it is not working

use Magento\Eav\Setup\EavSetup;
use Magento\Eav\Setup\EavSetupFactory;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\ModuleDataSetupInterface;
use Magento\Framework\Setup\UpgradeDataInterface;

class UpgradeData implements UpgradeDataInterface

    public function __construct(EavSetupFactory $eavSetupFactory)
       $this->eavSetupFactory = $eavSetupFactory;

    public function upgrade(ModuleDataSetupInterface $setup, ModuleContextInterface $context)
        /** @var EavSetup $eavSetup */
        $eavSetup = $this->eavSetupFactory->create(['setup' => $setup]);

        if (version_compare($context->getVersion(), '1.0.1', '<')) {

            $entityType = $eavSetup->getEntityTypeId('catalog_product');

            $eavSetup->updateAttribute($entityType, 'as_low_as', 'frontend_input','decimal', null);

How can we update the attribute type of an existing attribute?

  • Frontend input should be text

  • Backend type should be decimal

If wanting it to be a price, don't forget to add backend model: Magento\Catalog\Model\Product\Attribute\Backend\Price. And frontend_input should be price, backend_type should be decimal.

$eavSetup->updateAttribute($entityType, 'as_low_as', 'frontend_input','price', null);


We can remove the old one, and add new one:

 if (version_compare($context->getVersion(), '1.0.4', '<')) {
        $eavSetup->removeAttribute($entityType, 'as_low_as');
                'label' => 'As Low As',
                'input' => 'price',
                'type' => 'decimal',
                'source' => '',
                'required' => false,
                'visible' => true,
                'system' => false,
                'default' => '',
                'backend' => 'Magento\Catalog\Model\Product\Attribute\Backend\Price',
                'global' => \Magento\Eav\Model\Entity\Attribute\ScopedAttributeInterface::SCOPE_GLOBAL,
                'user_defined' => false,
                'searchable' => false,
                'filterable' => false,
                'comparable' => false,
                'visible_on_front' => false,
                'used_in_product_listing' => true,
                'unique' => false
  • When I update like this, It's value is stored as null in flat table. – SIBHI S Dec 5 '17 at 13:46
  • One more question, do you want to add price attribute? – Khoa TruongDinh Dec 5 '17 at 13:53
  • Did you allow showing this attribute in catalog product listing? – Khoa TruongDinh Dec 5 '17 at 14:08
  • Yes, I need as price attribute. Yes I'm allowing this in listing – SIBHI S Dec 5 '17 at 14:10
  • 1
    I have a suggestion for you! Before updating, you export the current data cab. And then, upgrade data attribute. Finally, importing data again. – Khoa TruongDinh Dec 6 '17 at 14:09

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