Flugg\Responder\Transformer::getRelations PHP Method

    public function getRelations() : array
    {
        $relations = array_unique(array_merge($this->getAvailableIncludes(), $this->relations));
        return array_filter($relations, function ($relation) {
            return $relation !== '*';
        });
    }

 /**
  * Parse a transformer class and set relations.
  *
  * @param  \Flugg\Responder\Transformer|callable $transformer
  * @param  \Illuminate\Database\ELoquent\Model   $model
  * @return \Flugg\Responder\Transformer|callable
  * @throws \InvalidTransformerException
  */
 protected function parseTransformer($transformer, Model $model)
 {
     if ($transformer instanceof Transformer) {
         $relations = $transformer->allRelationsAllowed() ? $this->resolveRelations($model) : $transformer->getRelations();
         $transformer = $transformer->setRelations($relations);
     } elseif (!is_callable($transformer)) {
         throw new InvalidTransformerException($model);
     }
     return $transformer;
 }