Laravel 5.2 - method [ajax] does not exist - ajax

Question

I've been trying to create an upload page for a webapplication. For sending the files to the server I want to use AJAX, as I've been using AJAX GETs for the whole front-end.
My problem is that when trying to use POST, under the circumstances I will provide you with in a moment, I get the error message 'Method [ajax] does not exist'.
My route (the POST one):
Route::group(['prefix' => 'organisatie', 'middleware' => ['web', 'auth', 'ajax'], 'namespace' => 'Organisatie'], function()
{
Route::group(['prefix' => '{organisatie}/documenten'], function ()
{
Route::get('/', 'DriveController#index')->name('drive.index');
Route::post('/upload', 'DriveController#upload')->name('drive.upload');
});
});
The route would come down to organisatie/{organisatie_id}/documenten/upload.
My DriveController#upload:
public function upload(Request $request)
{
$file = $request->file('file[]');
return response()->json($file);
}
My AJAX code:
var formData = new FormData();
utility.foreach(upload.fileArray.array, function (file) {
formData.append('file[]', file);
});
var ajax = {
url: '/organisatie/1/documenten/upload',
type: 'POST',
data: formData,
dataType: 'JSON',
processData: false,
success: function (data) {
console.log(data);
}
};
$.ajax(ajax);
Note:
utility.foreach is my own foreach implementation, and it does just
that.
upload.fileArray is an array wrapper I defined and it works as
expected.
Populating the upload.fileArray works fine and is tested. It's populated from an input[type=file] (multiple)'s FileList.
Any and all help is appreciated. Please ask if anything is unclear.

Answer 1

Thanks for the help. Neat's answer inspired me to check my Route set up, and it appeared that you should still use ?ajax=functionName on POST routes. In my case:
Route:
Route::post('/', 'DriveController#index')->name('drive.upload.post');
AJAX:
var ajax = {
url: '/organisatie/1/documenten?ajax=upload', <--- '/upload' to '?ajax=upload'
type: 'POST',
data: formData,
dataType: 'JSON',
processData: false,
success: function (data) {
console.log(data);
}
};
with DriveController#upload -> DriveController#ajaxUpload
For some reason I couldn't find this answer anywhere, so I hope this helps someone.