Laravel 5.6 inRandomOrder和OrderBy

Question

How to take datas from Database like this. But randomly and never duplicate.

$questions = Question::orderBy("created_at", 'desc')->skip(0)->take(3)->get();
$inquiries = Question::orderBy("created_at", 'desc')->skip(3)->take(3)->get();
$queries = Question::orderBy("created_at", 'desc')->skip(6)->take(3)->get();
$examinations = Question::orderBy("created_at", 'desc')->skip(9)->take(3)->get();
$inquisitions = Question::orderBy("created_at", 'desc')->skip(12)->take(3)->get();

It works but duplicates.

$questions = Question::inRandomOrder()->limit(10)->get();
$inquiries = Question::inRandomOrder()->limit(10)->get();
$queries = Question::inRandomOrder()->limit(10)->get();
$examinations = Question::inRandomOrder()->limit(10)->get();
$inquisitions = Question::inRandomOrder()->limit(10)->get();

Answer 1

How about you get them all with 1 call and sort them with PHP using collection splice method:

$all = Question::inRandomOrder()->limit(50)->get();

$questions = $all->splice(0, 10);
$inquiries = $all->splice(0, 10);
$queries = $all->splice(0, 10);
$examinations = $all->splice(0, 10);
$inquisitions = $all->splice(0, 10);

You could also just save IDs you've already pulled in an array and ignore those when doing new queries with ->whereNotIn() like this:

$except = []; // We'll save IDs of those pulled already here

$questions = Question::inRandomOrder()->limit(10)->get();
$except = array_merge($except, $questions->pluck('id')->toArray()); // Add IDs from upper call

// Add ->whereNotIn, to ignore IDs from $except
$inquiries = Question::inRandomOrder()->whereNotIn('id', $except)->limit(10)->get(); 
$except = array_merge($except, $inquiries->pluck('id')->toArray()); // Add IDs from upper call

$queries = Question::inRandomOrder()->whereNotIn('id', $except)->limit(10)->get();
$except = array_merge($except, $queries->pluck('id')->toArray()); // Add IDs from upper call

$examinations = Question::inRandomOrder()->whereNotIn('id', $except)->limit(10)->get();
$except = array_merge($except, $examinations->pluck('id')->toArray()); // Add IDs from upper call

$inquisitions = Question::inRandomOrder()->whereNotIn('id', $except)->limit(10)->get();