use  NonCatalyst::MyClass;

sub action :Local {
  my ( $self, $c ) = @_;
  $c->stash->{result} = NonCatalyst::MyClass->do_stuff($c->request->params->{some_param};
}

##</code><code>##

sub action :Local {
  my ( $self, $c ) = @_;
  $c->stash->{result} = $c->model('MyClass')->do_stuff($c->request->params->{some_param};
}