I can't get the route with full slug/post - php

Question

I am trying to create a blog, when trying to bring the previous record and the next record in sight this returns the "post" but not the full path that should be / single / {slug}
CONTROLLER
public function single($slug)
{
$post = Post::where('slug', $slug)->first();
$previous = Post::where('id', '<', $post->id)->orderBy('id', 'asc')->where('status', 'PUBLISHED')->first();
$next = Post::where('id', '>', $post->id)->orderBy('id')->where('status', 'PUBLISHED')->first();
return view('web.single')->with(compact('post', 'previous', 'next'));
}
view
#if (isset($previous))
<div class="alert alert-success">
<a href="{{ url($previous->slug) }}">
<div class="btn-content">
<div class="btn-content-title"><i class="fa fa-arrow-left"></i> Previous Post</div>
<p class="btn-content-subtitle">{{ $previous->title }}</p>
</div>
</a>
</div>
#endif
</div>
<div class="col-md-6">
#if (isset($next))
<div class="alert alert-success">
<a href="{{ url($next->slug) }}">
<div class="btn-content">
<div class="btn-content-title">Next Post <i class="fa fa-arrow-right"></i></div>
<p class="btn-content-subtitle">{{ $next->title }}</p>
</div>
</a>
</div>
#endif
Route
Route::get('/single/{slug}', 'Web\WorkController#single')->name('single');
When clicking on previous or next, the route shown by the browser is http://127.0.0.1:8000/et-autem-tempora
and should be
http://127.0.0.1:8000/single/et-autem-tempora

Answer 1

You are creating your url doing this:
<a href="{{ url($next->slug) }}">
...
</a>
The url('path') helper returns something like this: http://{base_url}/{path}.
Try to use your named route instead:
<a href="{{ route('single', ['slug' => $next->slug]) }}">
...
</a>
I think this should also work:
<a href="{{ route('single', $next->slug) }}">
...
</a>