如何将具有静态值的字段添加到mongodb查找查询? [英] How to add field with static value to mongodb find query?

问题描述

我们可以向mongodb 查找查询中添加一些具有静态值的自定义字段吗?

Can we add some custom field with static value to mongodb find query?

我正在尝试将API请求UId添加/附加到我们对mongodb进行的所有查询中，以便我们可以使用mongodb日志中的慢速查询来映射请求.

I am trying to add/append API request UId to all the queries that we are making to mongodb, so that we can map requests with slow queries from mongodb logs.

我正在通过在投影字段中使用'$literal'在聚合查询中执行此操作. 我的汇总查询看起来像:

I am doing it in aggregate queries by using '$literal' in projected fields. My Aggregate queries looks something like :

db.test.aggregate({
    $project: {
        "custom_id": { $literal: "uid" } 
        ..
    }
    ..
})

我也不能将每个字段都单独包含在投影字段中，而不能将"custom_id"字段添加为静态值.

Also I can't include each field individually in projected fields and add the "custom_id" field with the static value.

推荐答案

在mongoDb jira上找到了该问题的答案. 最好的方法是使用$ comment运算符. 这是指向文档的链接.

Found answer to the question on mongoDb jira. The best way to do this would be using the $comment operator. Here's the link to Documentation.

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