persegi/app/Models/Division.php

<?php

namespace App\Models;

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

class Division extends Model
{
    protected $fillable = ['name', 'description', 'leader_id'];

    public function members(): HasMany
    {
        return $this->hasMany(User::class);
    }

    public function leader(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(User::class, 'leader_id');
    }
}