Codeigniter get not working

This in the controller ajax

function get_class_posts()
{
echo json_encode($this->input->get());
}

Straight from the console line in chrome:

$.get("/ajax/get_class_posts",{user_id:2},function(data){window.vv = data})

RESPONSE >> 开发者_StackOverflow中文版OBJECT

window.vv

RESPONSE >> "{"\/ajax\/get_class_posts":""}"

when I do $.post(...) and $this->input->post() it works as it should (i.e. returns user_id:2)

Have you allowed the GET array to pass in Codeigniter. In your config/config.php make sure you have ...

$config['allow_get_array'] = TRUE;

Otherwise you will not have the GET variables.