如何用Swift可解码协议解码嵌套的JSON结构?

Here is my JSON

这是我的JSON

{
    "id": 1,
    "user": {
        "user_name": "Tester",
        "real_info": {
            "full_name":"Jon Doe"
        }
    },
    "reviews_count": [
        {
            "count": 4
        }
    ]
}
{
    "id": 1,