Error While Testing with Faker Code.

output.php

<?php

true
  
  
array:4 [
  0 => 1
  1 => 2
  2 => 3
  3 => 4
]
  
  
[]
  
  
  App\Post]8;;file://F:\Code\myGist\app\Post.php#L35\^]8;;\ {#4456
  #connection: null
  #table: null
  #primaryKey: "id"
  #keyType: "int"
  +incrementing: true
  #with: []
  #withCount: []
  #perPage: 15
  +exists: false
  +wasRecentlyCreated: false
  #attributes: array:1 [
    "category_id" => 1
  ]

Post.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

/**
 * App\Post
 */
class Post extends Model
{

    /**
     * Set the tags
     *
     * @param array $value
     * @return string
     */
    public function setTagsAttribute($value)
    {
        dump(!empty($value));
        //if (!empty($value))
            return (implode(',', $value));

    }

}

PostController.php

<?php

namespace App\Http\Controllers;

use App\Category;
use App\Post;
use App\Tag;
use Illuminate\Http\Request;

class PostController extends Controller
{
    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        $post->category_id = $request->get('category_id');
        //$post->tags =  $request->get('tags');
        if(!empty($request->get('tags')) ) {
            $post->tags = $request->get('tags'); // Triggers Mutator Post.php@setTagsAttribute output true

            dump($request->get('tags')); // output: array:4 [   0 => 1 ,  1 => 2  ,  2 => 3 , 3 => 4 ]
            dump($post->tags); // output: []
        }
        else
            $post->tags = '';
        dd($post); // Here there is not even a tags in attribute
    }


}