Laravel slug history system

I'm setting up a "slug history" system.

For example, if I had an article with the slug my-article but then edited the slug later to be my-new-article, I want my-article to redirect to my-new-article and still work.

The URL contains no ID, so it's just based on a unique slug.

I have a database table called slugs which stores all the slugs, new and old, attached to a specific article ID.

id | slug | article_id

private function oldSlug()
{
  $oldslug = DB::table('slugs')
                ->where('slug', $this->article_slug)
                ->first();
  if ($oldslug == null) {
    abort(404);
  } else {
    /*
    There is an article with that slug. Get the newest slug from the ID,
    and set the object property.
    */
    $article = Article::find($oldslug->article_id);
    $this->article_slug = $article->slug;
    $this->article_id = $article->id;
    // Now, I want to use the `show()` method again with the new info
  }
}

/**
 * Display the specified resource.
 *
 * @param  int  $id
 * @return \Illuminate\Http\Response
 */
public function show($category_slug, $article_slug)
{
  $this->category_slug = $category_slug;
  $this->article_slug = $article_slug;

  $article = Article::selectRaw('*, `articles`.`id` as article_id, `categories`.`name` as category_name, `categories`.`slug` as category_slug, `articles`.`slug` as article_slug')
                      ->join('categories', 'categories.id', '=', 'articles.category_id')
                      ->where(['articles.slug' => $article_slug, 'categories.slug' => $category_slug])
                      ->first();
  $article == null ? $this->oldSlug() : $this->article_id = $article->article_id;
  $this->addView();
  return view('article')->withArticle($article);
}

In the show() method, if the $article result is null, then it will go to the oldSlug() method to check any potential old slugs. If there's no old slugs, it just shows a 404, otherwise, it should show the article with the updated slug.

Problem is, redirects aren't working, nor calling the show method again. New to Laravel, any help would be great.

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