php/app/Models/Community.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Str;

class Community extends Model
{
    use HasFactory;

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

    protected static function boot()
    {
        parent::boot();

        static::creating(function ($community) {
            if (empty($community->slug)) {
                $community->slug = Str::slug($community->name);
            }
        });
    }

    public function creator()
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    public function subscribers()
    {
        return $this->belongsToMany(User::class)->withTimestamps();
    }

    public function posts()
    {
        return $this->hasMany(Post::class);
    }

    public function getRouteKeyName()
    {
        return 'slug';
    }
}