如何在每个帖子中显示类别

I want to show my categories at each of my posts,

So far I have tried the following:

@if(isset($post->category->name_slug))
   {{ action('PagesController@showCategory', ['id' => $post->category
       >name_slug ]) }} {{ $post->category->name }}
@endif

but still no result, any idea?

In order to display all categories of your post you just need to loop through the categories of the post like so :

I updated my code according to the change in your question

// post here refers to the current post you are displaying 
// so this loop may be contained inside another loop that displays the posts

    {{ $post->category->name }}

from the code you posted above, I doubt that you named your relationship in the Post model correctly, because it should be categories and not category

In your Post.php model set up the relationship to a category

public function category() {
    return $this->belongsTo(App\Category::class);
}

In your Category.php model, set up the relationship to many posts

public function posts() {
   return $this->hasMany(App\Post::class);
}

Now, as long as your posts table has a category_id column, you can call on these relationships.

Category: {{ $post->category->name }}

And of course, if you want to, say, list all the posts in a certain category:

foreach($category->posts as $post) {
    // do something here
}

If a post can have many categories, you need to set up a pivot table. posts, category_post, categories

On your category_post pivot table you have: post_id, category_id

This relationship is defined in your Post.php model like this:

public funtion categories() {
    return $this->belongsToMany(App\Category::class, 'category_post');
}

And to call this, of course you use the relationship like this:

Categories:

foreach($post->categories as $category) {
   {{ $category->name }}
}