title: How to avoid create record in laravel model creating event
body: <p>I'm currently using Laravel 8 and I want check a field when my model 'creating' event fired. If my field isn't null, I want cancel creating record.
  my event is like below:</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>protected static function booted(){
      static::creating(function ($contactMessage){
          if(request('birthday') != null)
              //Here I want Stop creating record but don't know how!!!
      });
  }</code></pre>
  </div>
  </div>
  </p>