/**
* Get all popular doctors.
*
* @param Request $request
*
* @return string
*/
public function getPopular(Request $request)
{
$this->validate($request, ['num' => 'integer|min:1']);
$num = $request->get('num');
if (empty($num)) {
$num = 10;
}
return Doctor::popular($num)->get();
}
