primitive not work

[zhuman90]

protected $availableIncludes = ['articles', 'articlesCount'];

    public function includeArticles(ArticleCategory $category) {
        return $this->collection($category->articles, new ArticleTransformer);
    }

    public function includeArticlesCount(ArticleCategory $category) {
        return $this->primitive($category->articles()->count());
    }

Call to undefined relationship [articlesCount] on model

i need help

[KorvinSzanto]

This sounds like an Eloquent error. Make sure you are able to successfully able to get the count from your Articles model.