applicant-site/app/Models/Department.php

<?php

namespace App\Models;

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

class Department extends Model
{
    use HasFactory;

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

    public function faculty(): BelongsTo
    {
        return $this->belongsTo(Faculty::class);
    }

    public function directions(): HasMany
    {
        return $this->hasMany('App\Models\Direction', 'department_id');
    }
}