Using the setPresenceVerifier Method in Laravel 11

Introduction of the setPresenceVerifier Method in the Laravel 11 Framework

Laravel is a popular framework for web development, and nowadays many developers are inclined towards it. One of the main tasks in Laravel is validating data, which gives us the ability to ensure the correctness of user information. In this regard, the Validator class in Laravel provides several tools for this process.

One of the interesting capabilities of this class is the setPresenceVerifier method. By using this method, you can define new ways to verify the existence of records in a specified database. This method is particularly useful when working with multiple databases or models, it becomes user-friendly.

When using setPresenceVerifier, you can add a custom verifier implementation of PresenceVerifierInterface to the Validator. This allows you to determine how and when to check if a record exists or not.

In the continuation, we will provide a practical example of using this method in Laravel to offer a better understanding.

Code Example

use Illuminate\Validation\Validator;
use Illuminate\Validation\PresenceVerifierInterface;

class CustomPresenceVerifier implements PresenceVerifierInterface {
    protected $db;

    public function __construct($db) {
        $this->db = $db;
    }

    public function getTable($table) {
        // Calculate the table name based on your needs
    }

    public function get($table, $id) {
        // Logic to check if record exists
    }
}

Validator::setPresenceVerifier(new CustomPresenceVerifier($db));

Code Explanation

Here, we defined a custom verifier class named CustomPresenceVerifier which implements the PresenceVerifierInterface. This class contains two main methods: getTable that calculates the table name based on your requirements and get that logically checks for the existence of the related record.
Thus, by using Validator::setPresenceVerifier, we have added an instance of CustomPresenceVerifier to the Validator.