applicant-site/app/Models/Admission.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class Admission extends Model
{
    use HasFactory;

    protected $fillable = [
        'id',
        'name',
        'position'
    ];

    public function documents(): HasMany
    {
        return $this->hasMany('App\Models\Document', 'admission_id');
    }
}