public function run()
 {
     $faker = Faker\factory::create();
     $users = User::lists('id')->All();
     $challenges = Challenge::lists('id')->All();
     $questions = Question::lists('id')->All();
     $options = Option::lists('id')->All();
     foreach (range(1, 5) as $index) {
         User::create(['user_id' => $faker->randomElement($users), 'challenge_id' => $faker->randomElement($challenges), 'active' => $faker->numberBetween($min = 0, $max = 1)]);
     }
 }
 public static function getlist()
 {
     $data = [];
     $data += ['' => '-- Selecciona categoria --'];
     $data += Challenge::lists('name', 'id')->toArray();
     return $data;
 }