Why does Laravel throw an error on assignment?

Question

Laravel

Good evening. I am not new to Laravel, after using 5.2 for a long time I decided to try 5.3. Decided to make a simple application. Created a migration

Schema::create('news', function (Blueprint $table) {
            $table->increments('id');
            $table->string('content');
            $table->timestamps();
        });

Described the model

class News extends Model
{
    protected $primaryKey = ['id'];
    protected $fillable = [
        'content', 'created_at', 'updated_at',
    ];
}

And when I try to assign like this:

$news = new News();
$news->content = $request->input('content');

Or even so

$news = new News();
$news->content = "test";

I get
Illegal offset type
at Model->getCasts() in Model.php line 2764
at Model->hasCast('content', array('date', 'datetime')) in Model.php line 2795
at Model->isDateCastable( 'content') in Model.php line 2884
at Model->setAttribute('content', 'test') in Model.php line 3478
at Model->__set('content', 'test') in AdminController.php line 29
In the database, this is a string, as elsewhere. But, it seems to me, for unknown reasons, he takes it for datetime. In general, what's wrong?

Answer 1

Problem solved.
protected $primaryKey = 'id';
not
protected $primaryKey = ['id'];
Noticed it right away)

Answer 2

decided to try 5.3

already 5.4 long ago
Well, try to register your castes
https://laravel.com/docs/5.4/eloquent-mutators#att...
Somewhere they did something wrong, since it takes a field for a date

Answer 3

By the way, created_at and updated_at can be omitted from fillable. And the error is clearly somewhere in the code, but from what is presented it is not visible