POST variables not seen in Symfony's 3.2 Controller - php

Question

Debugger shows, that there is POST data in request, but I cannot get it by $request->get('foo');
And $request->request->all(); gives array [0].
My Ajax POST request (by AngularJS):
...
$http.post('http://admin/about-company/setJSONObj',
{foo: 'bar'}
);
My controller with debugging info in comments (Symfony 3.2.9):
use Symfony\Component\HttpFoundation\Request;
...
public function updateAction(Request $request)
{
$foo = $request->get('foo'); // null
$requestType = $request->getContentType(); // json
$content = $request->getContent(); // {"foo":"bar"}
I used these approach on Symfony 2.7 project, and it worked fine, but I'm not sure, what's happening in these case?
Also, maybe there is any Symfony framework config variable that tells not to parse POST data, or hides it during caching the request?

Answer 1

For POST request is:
$request->request->get('foo');

Answer 2

Try using FormData for your client-side ajax's call
For example : try something like
var formData = new FormData();
formData.append('foo', 'bar')
$http.post('http://url',
formData
);
Ok, I wasn't paying attention that you used json so,
You wont get the content of $foo in request but you need to json_decode the $content
So by keeping the same way you sent data :
$http.post('http://admin/about-company/setJSONObj',
{foo: 'bar'}
);
You just have to call
use Symfony\Component\HttpFoundation\Request;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Route;
use Sensio\Bundle\FrameworkExtraBundle\Configuration\Method;
...
/**
* #Route("/setJSONObj", name="admin_pages_set_ajax_obj")
* #Method("POST")
*/
public function updateAction(Request $request)
{
$foo = $request->get('foo'); // null
$requestType = $request->getContentType(); // json
$content = $request->getContent(); // {"foo":"bar"}
$data = json_decode($content, true);
dump($data['foo']); // "foo"
//And you can know replace the data of the request. So
$request->request->replace($data);
My guess is because symfony need have the 'Content-Type' 'application/x-www-form-urlencoded' but Angular by default have a application/json (so you can override the headers on the $http.post call.

Answer 3

It turned out, my mistake was to expect POST variables in $request->request->all(); while posting JSON: see explanation https://www.toptal.com/....
For creating REST api with Symfony it's normal to use FOSRestBundle: see body listener. So, it solves my problem in elegant way.
Also, #henrily suggested a workaroud somebody can use, but it's just a workaround.