这是引用这个question.这是我的数据集:[{"rating":4,"ceatedAt":ISODate("2016-08-08T15:32:41.262+0000")},{"rating":3,"createdAt":ISODate("2016-08-08T15:32:41.262+0000")},{"rating":3,"ceatedAt":ISODate("2016-07-01T15:32:41.262+0000")},{"rating":5,"createdAt":ISODate("2016-07-01T15:32:41.262+0000")}]我希望能够在日期范围内以周或