cascade laravel

$table->dropForeign('answers_user_id_foreign');
$table->foreign('user_id')
->references('id')->on('users')
->onDelete('cascade');

Schema::create('posts', function (Blueprint $table) {
    $table->id();
    $table->foreignId('author')->constrained('users')->onDelete('cascade')->onUpdate('cascade');
    $table->timestamps();
});