Array to string conversion error in migration - laravel-5

Question

In my laravel 5.8 I set json field :
Schema::create('vote_categories', function (Blueprint $table) {
$table->increments('id');
$table->string('meta_description', 255)->nullable();
$table->json('meta_keywords')->nullable();
$table->timestamp('created_at')->useCurrent();
and some init data in seeder :
DB::table( 'vote_categories' )->insert([
'id' => 1,
'name' => 'Classic literature',
'slug' => 'classic-literature',
'active' => true,
'in_subscriptions' => true,
'meta_description' => '',
'meta_keywords' => ['Classic literature'],
]);
and in model :
class VoteCategory extends MyAppModel
{
protected $table = 'vote_categories';
protected $primaryKey = 'id';
public $timestamps = false;
protected $casts = [
'meta_keywords' => 'array'
];
But running migration I got error :
$ php artisan migrate
Migration table created successfully.
...
Migrating: 2018_07_13_051201_create_vote_categories_table
ErrorException : Array to string conversion
at /mnt/_work_sdb8/wwwroot/lar/votes/vendor/laravel/framework/src/Illuminate/Support/Str.php:353
349|
350| $result = array_shift($segments);
351|
352| foreach ($segments as $segment) {
> 353| $result .= (array_shift($replace) ?? $search).$segment;
354| }
355|
356| return $result;
357| }
Exception trace:
1 Illuminate\Foundation\Bootstrap\HandleExceptions::handleError("Array to string conversion", "/mnt/_work_sdb8/wwwroot/lar/votes/vendor/laravel/framework/src/Illuminate/Support/Str.php")
/mnt/_work_sdb8/wwwroot/lar/votes/vendor/laravel/framework/src/Illuminate/Support/Str.php:353
2 Illuminate\Support\Str::replaceArray("?", [], "insert into `vt2_vote_categories` (`id`, `name`, `slug`, `active`, `in_subscriptions`, `meta_description`, `meta_keywords`) values (?, ?, ?, ?, ?, ?, ?)")
/mnt/_work_sdb8/wwwroot/lar/votes/vendor/laravel/framework/src/Illuminate/Database/QueryException.php:56
Please use the argument -v to see more details.
Why error ? I supposed that $casts array must be used in ->insert methods, but it looks not like so.
How to fix it ?
Thanks!

Answer 1

You are trying to insert an array in the JSON column datatype, hence the error, try changing it in json before inserting:
DB::table( 'vote_categories' )->insert([
'id' => 1,
'name' => 'Classic literature',
'slug' => 'classic-literature',
'active' => true,
'in_subscriptions' => true,
'meta_description' => '',
'meta_keywords' => json_encode(['Classic literature']),
]);