关于node+mongoose多层查询的问题

Question

我的json结构如下：
{

"date": "20171123",
"stories": [
    {
        "images": "1.jpg",
        "title": "标题1"
    },
    {
        "images": "2.jpg",
        "title": "标题2"
    },
    {
        "images": "3.jpg",
        "title": "标题3"
    }
],
"top_stories": [
    {
        "top_images": "top1.jpg",
        "top_title": "top1"
    },
     {
        "top_images": "top2.jpg",
        "top_title": "top2"
    },
    {
        "top_images": "top3.jpg",
        "top_title": "top3"
    }
]

}
请问如何定义schema以及如何进行增删改查？