创建后，帖子会出现多次

Question

我在模型中使用了易拉拉（https://github.com/cviebrock/eloquent-sluggable）的laravel软件包

public function sluggable()
{
    return [
        'slug' => [
            'source' => 'subject'
        ]
    ];
}

但是任何时候我使用创建方式发布帖子时，它看起来好像是5次或更多次，这确实很烦人，我需要如何解决此问题的帮助。

控制器

<?php

namespace App\Http\Controllers;

use App\News;
use App\Tag;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class NewsController extends Controller
{
    /**
     * Show the form for creating a new resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function create()
    {   
        return view('news.create');
    }

    /**
     * Store a newly created resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return \Illuminate\Http\Response
     */
    public function store(Request $request)
    {
        //validate
        $this->validate($request, [
            'subject'=>'required|min:10',
            'tags' => 'required',
            'body' => 'required|min:20'
        ]);

        //store
        $news=auth()->user()->news()->create($request->all());
        $news->tags()->attach($request->tags);

        //redirect
        return redirect()->route('news.index');
    }

    /**
     * Display the specified resource.
     *
     * @param  \App\News  $news
     * @return \Illuminate\Http\Response
     */
    public function show(News $news)
    {   
        return view('news.single', compact('news', 'tag'));
    }

    /**
     * Show the form for editing the specified resource.
     *
     * @param  \App\News  $news
     * @return \Illuminate\Http\Response
     */
    public function edit(News $news)
    {   
        return view('news.edit', compact('news'));
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \App\News  $news
     * @return \Illuminate\Http\Response
     */
    public function update(Request $request, News $news)
    {
        if (auth()->user()->id !== $news->user_id) {
            abort(401, "Please Login");
        }

        $this->validate($request, [
            'body' => 'required|min:20'
        ]);

        $news->update($request->all());

        return redirect()->route('news.show', $news->slug)->withMessage('News Updated');
    }
}

我怎样才能使我发布的帖子只有一次而不是5次，我真的需要这个才能正常工作，如果有人可以帮助我解决这个问题，我将不胜感激。