Why i cannot add foreign key in migration, it creates different one.

Hello,
Hope you all doing well!,. I'm trying to modify an existing table to add a column which i need to be foreignkey  to other table but it not creating.

My code :

PHP Code:

<?php

namespace App\Database\Migrations;

use CodeIgniter\Database\Migration;

class AddLeaveApplicationIdToLeaveAdjustMentTable extends Migration
{
    public function up()
    {
        $fields = [

            'leave_application_id' => [
    
                'type' => 'INT',
                'constraint' => 7,
                'unsigned' => true
            ],
        ];
    
        $this->forge->addForeignKey('leave_application_id', 'leave_applications', 'id', '', '', 'leave_application_id_fk');
        $this->forge->addColumn('leave_adjustment', $fields);

    }

    public function down()
    {
        $this->forge->dropForeignKey('leave_application_id_fk', 'leave_adjustment');
        $this->forge->dropColumn('leave_adjustment', 'leave_application_id');

    }
    
} 


This not creating foreignkey to the leave_applications table. instead it created "leave_adjustment_emp_id_foreign".

How i can solve this issue ?

---

This creates column called "leave_application_id" but not creating foreign key, what wrong im doing here ?

See https://codeigniter4.github.io/CodeIgnit...to-a-table

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

See https://codeigniter4.github.io/CodeIgnit...to-a-table

So I need to add this also ?

PHP Code:

$this->forge->processIndexes('leave_adjustment');

I'm correct ?