how to create custom slug

[bad-robo]

hi

this is controller code
`<?php

namespace App\Http\Controllers\back;

use App\Article;
use App\Category;
use Illuminate\Http\Request;
use App\Http\Controllers\Controller;

class ArticleController extends Controller
{
/**
* Display a listing of the resource.
*
* @return \Illuminate\Http\Response
*/
public function index()
{
$articles = Article::orderBy('id' , 'DESC')->paginate(20);
return view('back.article.article' , compact('articles'));
}

/**
 * Show the form for creating a new resource.
 *
 * @return \Illuminate\Http\Response
 */
public function create()
{
    $categories = Category::all()->pluck('id','name');
     return view('back.article.create',compact('categories'));
}

/**
 * Store a newly created resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @return \Illuminate\Http\Response
 */
public function store(Request $request)
{

    $messages = [
        'name.required' => 'فیلد عنوان را وارد نمایید.',
        //'slug.required' => 'فیلد نام مستعار را وارد نمایید.',
        'description.required' => 'فیلد توضیحات را وارد نمایید.',
        'slug.unique' => 'فیلد نام مستعار تکرای است , آن را عوض نمایید.',
    ];

    $validatedData = $request->validate([
        'name' => 'required',
        //'slug' => 'required|unique:articles',
        'description' => 'required',
    ] , $messages );


    $article = new Article();
    try{

        if ($request->slug){
            $model = EloquentModel::create(['name' => 'my name']); //slug is now "my-name";
            $model->slug = 'my-custom-url';
            $model->save(); //slug is now "my-custom-url";
        }
        //$article->slug_seo =$request->slug_seo;
        $article = $article->create($request->all());
        $article->categories()->attach($request->categories);

    } catch (Exceptionion $exception){
        switch ($exception->getCode()){
            case 23000:
                $msg = 'فیلد نام مستعار تکرای است , آن را عوض نمایید.';
                break;
        }
        return redirect()->back()->with('warning' , $msg);
    }

    $msg = 'ذخیره نوشته جدید با موفیقت انجام شد.';
    return redirect(route('admin.articles'))->with('success' , $msg);
}

/**
 * Display the specified resource.
 *
 * @param  \App\Article  $articles
 * @return \Illuminate\Http\Response
 */
public function show(Article $article)
{
    //
}

/**
 * Show the form for editing the specified resource.
 *
 * @param  \App\Article  $articles
 * @return \Illuminate\Http\Response
 */
public function edit(Article $article)
{
    $categories = Category::all()->pluck('id','name');
    return view('back.article.edit' , compact('article' , 'categories' ));
}

/**
 * Update the specified resource in storage.
 *
 * @param  \Illuminate\Http\Request  $request
 * @param  \App\Article  $articles
 * @return \Illuminate\Http\Response
 */
public function update(Request $request, Article $article)
{


    $validatedData = $request->validate([
        'name' => 'required',
        'slug' => 'required|unique:articles',
        'description' => 'required',
    ]  );

    try{

        //$article->slug_seo =$request->slug_seo;
        $article->update($request->all());
        $article->categories()->sync($request->categories);

    } catch (Exceptionion $exception){
        switch ($exception->getCode()){
            case 23000:
                $msg = 'فیلد نام مستعار تکرای است , آن را عوض نمایید.';
                break;
        }
        return redirect()->back()->with('warning' , $msg);
    }

    $msg = 'ذخیره نوشته جدید با موفیقت انجام شد.';
    return redirect(route('admin.articles'))->with('success' , $msg);
}

/**
 * Remove the specified resource from storage.
 *
 * @param  \App\Article  $articles
 * @return \Illuminate\Http\Response
 */
public function destroy(Article $article)
{


    try{
        $article->delete();
    }catch (Exceptionion $exception){
        return redirect()->back()->with('warning' , $exception->getCode());
    }

    $msg = ' نوشته با موفیقت حذف شد.';
    return redirect(route('admin.articles'))->with('success' , $msg);
}

public function updatestatus(Article $article)
{
    if ($article->status == 1){
        $article->status =0;
    }else{
        $article->status =1;
    }
    $article->save();
    $msg = 'بروزرسانی با موفیقت انجام شد.';
    return redirect(route('admin.articles'))->with('success' , $msg);
}

}
`

EloquentModel not found