title: How to using one route with multiple dto on Nestjs?
body: <p>Currently I am using NestJS to build restful api.
  I am having a <code>ValidationPipe</code> problem. it only works at controller method and  not working with service methods.</p>
  
  <p>I need to make choices for different <code>DTO</code> class (<code>UserCreateDTO</code>, <code>StaffCreateDTO</code>,...) for each <code>ROLE</code> (admin, staff, user) on a <code>route</code>.</p>