interface UserRepository extends CrudRepository<User, String>,
                                 QueryDslPredicateExecutor<User>,
                                 QuerydslBinderCustomizer<QUser> {

  @Override
  default public void customize(QuerydslBindings bindings, QUser user) {

    bindings.bind(user.username).first((path, value) -> path.contains(value))
    bindings.bind(String.class)
      .first((StringPath path, String value) -> path.containsIgnoreCase(value));
    bindings.excluding(user.password);
  }
}