repo.php

<?php

class ArticlesController extends ApiController
{

    // Like this
    /**
     * Store a newly created resource in storage.
     *
     * @param  \App\Http\Requests\CreateArticleRequest  $request
     * @param  \App\Repositories\ArticleRepository      $articleRepository
     * @return \Illuminate\Http\Response
     */
    public function store(CreateArticleRequest $request, ArticleRepository $articleRepository)
    {
        $article = $articleRepository->store($request);        
        return $this->respondWithItem($article, new ArticleTransformer);
    }
    
    
    //Or like this

    /**
     * Store a newly created resource in storage.
     *
     * @param  \App\Http\Requests\CreateArticleRequest  $request
     * @return \Illuminate\Http\Response
     */
    public function store(CreateArticleRequest $request)
    {
        $article = new Article;
        $article->fill($request->except('published_at'));
        $article->published_at = null;
        $article->save();
        
        return $this->respondWithItem($article, new ArticleTransformer);
    }

}