ice framework documentation ice doc v1.10.1
    
namespace Ice\Validation\Validator;

use Ice\Di;
use Ice\Validation;
use Ice\Validation\Validator;
use Ice\Db\Driver\Mongodb;

/**
 * Exists validator.
 *
 * @package     Ice/Validation
 * @category    Security
 * @author      Ice Team
 * @copyright   (c) 2014-2023 Ice Team
 * @license     http://iceframework.org/license
 *
 * 

 *  $validation = new Ice\Validation();
 *
 *  $validation->rules([
 *      'userName' => [
 *          'exists' => [
 *              'from' => 'users',
 *              'custom' => 'username'
 *          ],
 *      ]
 *  ]);
 *
 *  $valid = $validation->validate($_POST);
 *
 *  if (!$valid) {
 *      $messages = $validation->getMessages();
 *  }
 * 
*/ class Exists extends Validator { /** * Validate the validator * Options: from (0), custom (1), insensitive (2), label, message * * @param Validation validation * @param string field * @return boolean */ public function validate( validation, string! field) -> boolean { var value, label, message, i18n, replace, di, db, from, custom, insensitive, options, result; let value = validation->getValue(field); if value === "" || value === null { return true; } let di = Di::$fetch(), db = di->get("db"); if this->has(0) { let from = this->get(0); } else { let from = this->get("from"); } // Specifying a custom column name if this->has(1) { let custom = this->get(1); } else { let custom = this->get("custom"); } if empty custom { let custom = field; } // Case insensitive if this->has(2) { let insensitive = this->get(2); } else { let insensitive = this->get("insensitive"); } let options = insensitive ? ["insensitive": true] : [], result = db->findOne(from, [custom: value], options); if !result { if this->has("label") { let label = this->get("label"); } else { let label = validation->getLabel(field); } if this->has("message") { let message = this->get("message"); } else { let message = validation->getDefaultMessage("exists"); } // Translate strings if validation->getTranslate() === true && validation->getDi()->has("i18n") { let i18n = validation->getDi()->get("i18n"), label = i18n->translate(label), message = i18n->translate(message); } let replace = [":field": label]; validation->addMessage(field, strtr(message, replace)); return false; } return true; } }