Art4\JsonApiClient\AccessInterface::has PHP Method

    public function has($key);

 /**
  * Parses the data for this element
  *
  * @param mixed $object The data
  *
  * @return self
  *
  * @throws ValidationException
  */
 public function parse($object)
 {
     if (!is_object($object)) {
         throw new ValidationException('Relationships has to be an object, "' . gettype($object) . '" given.');
     }
     if (property_exists($object, 'type') or property_exists($object, 'id')) {
         throw new ValidationException('These properties are not allowed in attributes: `type`, `id`');
     }
     $object_vars = get_object_vars($object);
     if (count($object_vars) === 0) {
         return $this;
     }
     foreach ($object_vars as $name => $value) {
         if ($this->parent->has('attributes.' . $name)) {
             throw new ValidationException('"' . $name . '" property cannot be set because it exists already in parents Resource object.');
         }
         $relationship = $this->manager->getFactory()->make('Relationship', [$this->manager, $this]);
         $relationship->parse($value);
         $this->container->set($name, $relationship);
     }
     return $this;
 }