How to use trait in Laravel model factory?

Solution:

Probably not what you’re looking for but here goes:

You can create an inline class that defines a function that returns the real function you want to use. That inline class can use a trait.

Note: Anonymous classes were added in PHP 7

<?php

use App\Working;
use App\Traits\Calculate;

// ...
$factory->define(App\Working::class, (new class {
     use Calculate;
     public function generatorFunction() {
         return function (Faker\Generator $faker) {
             // ...
             $getData = $this->getData();
             // ...
             return ['get_data' => $getData];

         };
     }
 })->generatorFunction());

Update:

Since Laravel 8 model factories are now classes instead of functions so can use traits making the above solution unnecessary.