是“分组依据"吗?Meteor 中的聚合查询可能吗? [英] Are "group by" aggregation queries possible in Meteor, yet?

问题描述

Mongo 风格的 db.collection.group(...) 查询在 Meteor 中可行吗?我希望我可以在服务器上运行这样的东西(coffeescript):

Is a Mongo-style db.collection.group(...) query possible in Meteor, yet? I was hoping i could run something like this on the server (coffeescript):

Meteor.publish "top10", ->
    Records.group
        key: {name:true}
        reduce: (obj, agg) -> agg.count++
        initial: {count:0}

推荐答案

实际上还没有.

Meteor 使用 node-mongo-native 在服务器端做 CURD，而在客户端使用 minimongo.并且 Meteor 在双方保持相同的 API.

Meteor uses node-mongo-native to do CURD in the server-side, whilst minimongo in the client-side. And Meteor keeps same API in the both side.

文档说-

在此版本中，Minimongo 有一些限制:

In this release, Minimongo has some limitations:

...

不支持 findAndModify、upsert、聚合函数和 map/reduce.

findAndModify, upsert, aggregate functions, and map/reduce aren't supported.

然而，node-mongo-native 支持它们，所以我认为 Meteor 只是没有为我们公开相关的 API.你可以看一下packages/mongo-livedata/mongo_driver.js，并帮助自己.

However, node-mongo-native supports them, so I think Meteor just doesn't expose the related API for us. You can take a look at packages/mongo-livedata/mongo_driver.js, and help yourself.

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