Laravel 5.1中返回函数和调用函数之间的区别

Question

我做了一个函数，可以在发布的文章中添加评论，然后将该函数放入ArticlesController中。最后调用完该函数后，我尝试为该特定文章返回show()函数，然后尝试调用$this->show('passing in params')，但调用该函数却给了我空白页面，我现在很困惑调用和返回函数之间是否有任何区别，这是执行此类操作的正确方法？

class ArticlesController extends Controller
{
public function show(Article $article, Comment $comments)
{
    $comments = $article->comments;

    return view('articles.show', compact('article', 'comments'));
}
 public function addComment(Article $article, Request $request)
{
    $this->validate($request, [
        'comment' => 'required|min:3|max:255'
    ]);

    $comments = new Comment($request->all());

    $comments->article_id = $article->id;

    Auth::user()->comments()->save($comments);

    return $this->show($article, $comments);
}

  

routes.php

<?php
Route::post('articles/{articles}', 'ArticlesController@addComment');
Route::resource('articles', 'ArticlesController');

Route::get('tags/{tags}', 'TagsController@show');
Route::controllers([
'auth' => 'Auth\AuthController',
'password' => 'Auth\PasswordController'
]);