Customer.php

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<?php
namespace Magento\SalesRule\Model\ResourceModel\Rule;

class Customer extends \Magento\Framework\Model\ResourceModel\Db\AbstractDb
{
    protected function _construct()
    {
        $this->_init('salesrule_customer', 'rule_customer_id');
    }

    public function loadByCustomerRule($rule, $customerId, $ruleId)
    {
        $connection = $this->getConnection();
        $select = $connection->select()->from(
            $this->getMainTable()
        )->where(
            'customer_id = :customer_id'
        )->where(
            'rule_id = :rule_id'
        );
        $data = $connection->fetchRow($select, [':rule_id' => $ruleId, ':customer_id' => $customerId]);
        if (false === $data) {
            // set empty data, as an existing rule object might be used
            $data = [];
        }
        $rule->setData($data);
        return $this;
    }
}