Routes vs Type checking for Action Parameters, best practice?

Lets say I have a controller Books with an action view() defined as follows: 

class BooksController extends AppController {

public function view($id) {

// something

}

}

Let's assume that $id is supposed to be of a numeric type. 

I see two options; 

1) Setup the route so that it only connects for instance books/view/{integer} to  Books->view($id)

2) Have general routing like the defaults in CakePHP and include code in view() to make sure that $id is set and is numeric. 

Which is better practice? 

In my view I think the former is cleaner and less magicky. This is something I enjoyed working with the Play Framwork, that you explicitly had to connect a route to each action. 

What is your opinion?

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