You say you don't send a tag to the index route

So you are running this line

$news= News::latest()->paginate(15);

Which has got NOTHING to do with tags or pivot table.

Check which path you are taking through the index controller using dd();

@snapey The problem will have to do with storing the news id and tag id inside the news_tag table. The recent news ID is 31 and i used tag ID 1 with it.

But on the news_tag table the recent news ID is not 31 but 12 but the tag ID is 1

@snapey

Using this

public function index(Request $request, $tag=null)
    {   
        if($tag){
            $tag=Tag::where('url',$tag)->first();
            $news=$tag->news()->latest()->paginate(15);
        }else{
            dd();
        }
        return view('categories.news',compact(['news','tag']));
    }

The link showing is http://localhost:8000/category/

But the post appears only once in http://localhost:8000/category/new

Okay, so with that dd() in your controller, you should get an empty page when you don't provide a tag in the link. Is that what you're getting?

But don't you have a different controller for category?

@snapey No i do not but i use it like this Route::get('category/{tag?}', 'NewsController@index')->name('news.index');

@mware yes that is what i am getting with dd();

and if you change that dd to

dd(News::latest()->get());

@snapey using

dd(News::latest()->get());

The URL is http://localhost:8000/category , but the post does not get duplicated.

But i got collection and arrays of items on http://localhost:8000/category

i give up

your last post, the urls are identical but you say you get different results