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I need to extend the functionality of Magento Catalog price rules.

I want to be possible to have a rule or a field to have the possibility to select the country where the rule should apply.

So basically, I select Italy, the rule should only apply on frontend to customers logged with an address located in Italy.

I assume it's linked to catalogrule_product_price table where I should probably add columns (As how the customer_group is managed) but I don't know how to properly modify the code in the indexer to have :

 1. The correct prices indexed
 2. The correct prices displayed on frontend

I'm also interested in a solution for any customer attributes :)

How can I achieve that ?

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You need to add a row to the catalogrule table. Use the Setup Script to acheive this

namespace Vendor\Namespace\Setup;

use Magento\Framework\Setup\InstallSchemaInterface; use Magento\Framework\Setup\ModuleContextInterface; use Magento\Framework\Setup\SchemaSetupInterface;

class InstallSchema implements InstallSchemaInterface {

public function install(SchemaSetupInterface $setup, ModuleContextInterface $context)
{
    $setup->startSetup();
    $setup->getConnection()->addColumn(
    $setup->getTable('catalogrule'),
        'new_column',
        [
            'type' => \Magento\Framework\DB\Ddl\Table::TYPE_TEXT,
            'length' => 32,
            'nullable' => false,
            'default' => '',
            'comment' => 'New Column'
        ]
    );

    $setup->endSetup();
} }

If you need that to be displayed in the UI form, then add the new column in the Vendor/Namespace/view/adminhtml/ui_component/catalog_rule_form.xml XML file

<?xml version="1.0" encoding="UTF-8"?>
<form xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Ui:etc/ui_configuration.xsd">
    <fieldset name="rule_information">
        <field name="test_column">
            <argument name="data" xsi:type="array">
                <item name="config" xsi:type="array">
                    <item name="label" xsi:type="string">Test Column</item>
                    <item name="visible" xsi:type="boolean">true</item>
                    <item name="dataType" xsi:type="string">text</item>
                    <item name="formElement" xsi:type="string">input</item>
                    <item name="source" xsi:type="string">catalog_rule</item>
                    <item name="dataScope" xsi:type="string">test_column</item>
                    <item name="sortOrder" xsi:type="number">50</item>
                    <item name="validation" xsi:type="array">
                        <item name="required-entry" xsi:type="boolean">true</item>
                    </item>
                </item>
            </argument>
        </field>
    </fieldset>
</form>
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