public function createFromInput($input)
{
$book = $this->book->newInstance($input);
$book->slug = $this->findSuitableSlug($book->name);
$book->created_by = user()->id;
$book->updated_by = user()->id;
$book->save();
$this->permissionService->buildJointPermissionsForEntity($book);
return $book;
}