Answers for "laravel eloquent join two models"

laravel + join 2 eloquent queries

$select->joinSub(
                    $selectSubQry,
                    'ag',
                    'ag.id',
                    '=',
                    'agp.userId'
                );

laravel eloquent join two models

Event::whereHas('participants', function ($query) {
    return $query->where('IDUser', '=', 1);
})->get();