class User extends Model
{
    public function profile(): HasOne
    {
        return $this->hasOne(Profile::class);
    }
}

class Profile extends Model
{
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }
}

class Post extends Model
{
    public function comments(): HasMany
    {
        return $this->hasMany(Comment::class);
    }
}

class User extends Model
{
    public function roles(): BelongsToMany
    {
        return $this->belongsToMany(Role::class)
            ->withTimestamps()
            ->withPivot('assigned_by', 'expires_at');
    }
}

class Comment extends Model
{
    public function commentable(): MorphTo
    {
        return $this->morphTo();
    }
}

class Post extends Model
{
    public function comments(): MorphMany
    {
        return $this->morphMany(Comment::class, 'commentable');
    }
}

// ❌ N+1 استعلام
$posts = Post::all();
foreach ($posts as $post) {
    echo $post->author->name; // 1 + N استعلام
}

// ✅ تحميل مشتاق — استعلامان فقط
$posts = Post::with('author')->get();