app/migrations/Version20200415135706.php

<?php

declare(strict_types=1);

namespace Mautic\Migrations;

use Doctrine\DBAL\Schema\Schema;
use Doctrine\Migrations\Exception\SkipMigration;
use Mautic\CoreBundle\Doctrine\AbstractMauticMigration;

final class Version20200415135706 extends AbstractMauticMigration
{
    public function preUp(Schema $schema): void
    {
        if ($schema->getTable("{$this->prefix}form_fields")->hasColumn('mapped_object')) {
            throw new SkipMigration('Schema includes this migration');
        }
    }

    public function up(Schema $schema): void
    {
        $this->addSql("ALTER TABLE {$this->prefix}form_fields 
            ADD mapped_object VARCHAR(191) DEFAULT NULL,
            ADD mapped_field VARCHAR(191) DEFAULT NULL");

        // All field that starts with company belongs to the company object.
        // Except the company field itself that belongs to the contact (lead) object.
        $this->addSql("UPDATE {$this->prefix}form_fields 
            SET mapped_object = CASE
                WHEN lead_field LIKE 'company%' AND lead_field != 'company' THEN 'company'
                ELSE 'contact'
            END, mapped_field = lead_field 
            WHERE lead_field IS NOT NULL");
    }
}