public function run()
{
$qas = Qa::all();
$tags = Tag::lists('id');
$last = count($tags) - 1;
foreach ($qas as $qa) {
$qa->tags()->attach($tags[rand(0, $last)]);
}
foreach ($qas as $qa) {
$qa->tags()->attach($tags[rand(0, $last)]);
}
foreach ($qas as $qa) {
$qa->tags()->attach($tags[rand(0, $last)]);
}
}
