Ouzo\Model::getFields PHP Method

    public static function getFields()
    {
        return static::metaInstance()->_getFields();
    }

 public function matches($argument)
 {
     if (get_class($this->expected) !== get_class($argument)) {
         return false;
     }
     $actualAttributes = Arrays::filterByAllowedKeys($argument->attributes(), $this->expected->getFields());
     return $this->expectedAttributes == $actualAttributes;
 }