相关疑难解决方法(0)

我有一个像这个结构的"状态"集合 -

{
    _id: ObjectId("545a0b63b03dbcd1238b4567"),
    status: 1004,
    comment: "Rem dolor ipsam placeat omnis non. Aspernatur nobis qui nisi similique.",
    created_at: ISODate("2014-11-05T11:34:59.804Z")
},
{
    _id: ObjectId("545a0b66b03dbcd1238b4568"),
    status: 1001,
    comment: "Sint et eos vero ipsa voluptatem harum. Hic unde voluptatibus et blanditiis quod modi.",
    created_at: ISODate("2014-11-05T11:35:02.814Z")
}
....
....

我需要从该集合中获得15分钟间隔的结果.