laravel wherein on many to many relation code example

Example 1: many to many relationship laravel

use App\Models\User;

$user = User::find(1);

$user->roles()->attach($roleId);

Example 2: laravel relation has many

// Post model 
public function comments()
{
  return $this->hasMany(Comment::class);
}

// Post controller
$comments = Post::find(1)->comments;