Symfony2 redirectToRoute没有返回

Question

redirectToRoute has to be returned by a controller action to work. For example:

function testAction() {
    return $this->redirectToRoute('homepage');
}

But how is it possible to call the redirect outside the action function (from an another function)? Like:

function checkError() {
    $this->redirectToRoute('error');
}

Answer 1

Controller must return Response. There is no way (almost) to avoid it.

What you can do is use exception in your internal function(s), catch exception in controller and return response from controller. Ex.

function testAction() {
    try {
        checkError();
    } catch(Exception $e) {
        return $this->redirectToRoute('error');
    }
    $this->redirectToRoute('success');
}

Then in your checkError() function throw an exception.

function checkError() {
    throw new Exception();
}

This is a basic case. There are more advanced ways to handle exceptions in Symfony2 and there are more advanced ways of throwing exceptions as well.

Answer 2

redirectToRoute() will always need to be returned because what it actually does is send a Response to the browser that triggers the redirect. If nothing is returned from a method that has a redirectToRoute() call in it, the redirect doesn't make its way back to the browser and no redirect will happen.

Answer 3

Why not do it like this:

public function testAction() {
    if (checkError()) {
        return $this->redirectToRoute('homepage');
    } else {
        // return normal response
    }
}

private function checkError() {
    //test something
    if ($error) return true; //I know I could just return $error
    return false;            //just making this clear
}