node.js - mongoose查询结果去重

Question

查询结果ID是不变的，但其余数据是不同的。每条数据按ID为标识，会有许多条。
但有的情况下，只要提取最新的一条数据，所以会出现很多无用数据。想要能按ID字段，去除重复数据。

查了文档，没发现有对结果去重的参数。不知道是不是看漏了。
除了自己每个都针对性的写，是否有什么其他方便的实现方法？

Answer 1

 Platform.distinct(field).exec();

distinct keyword

Answer 2

If you understand the requirements correctly, you can refer to the content of the following post, which is probably implemented using aggregate:

https://segmentfault.com/q/10...

In addition, RDBMS's distinct can support multiple Column operations; currently MongoDB's distinct only supports one field operation, but MongoDB's aggregate provides rich functions to meet such needs.

For reference!

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