按属性过滤对象并使用 jmespath 中的键选择

问题描述

我正在尝试根据子属性的值过滤 jmespath 中对象的属性，并希望包含仅那些将子属性设置为特定值的属性.

I'm trying to filter properties of an object in jmespath based on the value of a subproperty and want to include only those properties where the subproperty is set to a specific value.

基于此示例数据:

{
  "a": {
    "feature": {
      "enabled": true,
    }
  },
  "b": {
  },
  "c": {
    "feature": {
      "enabled": false
     }
  }
}

我想获取一个包含启用该功能的所有属性的对象.

I'd like to get an object with all properties where the feature is enabled.

{
  "a": {
    "feature": {
      "enabled": true,
    }
  }
}

我想我可以使用这个 jmespath 查询来过滤 属性的对象.enabled 设置为 true.不幸的是，它似乎不起作用，而是返回一个空数组.

I figured I could use this jmespath query to filter the objects where property. enabled is set to true. Unfortunateley, it doesn't seem to work and instead returns an empty array.

*[?feature.enabled==`true`]

*.feature.enabled 或 *[feature.enabled] 只返回没有任何上下文的布尔值.

*.feature.enabled or *[feature.enabled] return just the boolean values without any context.

即使 *[?feature.enabled==true] 可以工作，它也只是属性值的数组，但我需要键 (a 和 c) 也是如此.有没有办法在 jmespath 中做到这一点?

Even if *[?feature.enabled==true] would work, it would just be an array of the property values, but I need the keys (a and c) aswell. Is there any way to make this happen in jmespath?

这都是 ansible playbook 的一部分，所以肯定会有一种方法来以不同的方式(Jinja2 模板或自定义插件)实现选择，但我想尝试 jmespath 并且会推理，它应该能够做到这样一个任务.

This is all part of an ansible playbook, so there would certainly be a way to achieve selection in a different way (Jinja2 templates or custom plugin) but I wanted to try jmespath and would reason, that it should be capable of such a task.

推荐答案

抱歉，AFAIK 在原生 JMESPath 中这是不可能的.
在 to_entries 等不同工具中有用于此目的的自定义内置函数="noreferrer">jq.
对于 jmespath.py 和 Ansible，有挂起 pull request 实现按键操作.

Sorry, but AFAIK this is impossible in native JMESPath.
There are custom built-in functions for this purpose in different tools like to_entries in jq.
For jmespath.py and thus for Ansible there is hanging pull request to implement keys manipulation.

更新:我制作了json_query的补丁版本过滤器.
有关其他信息，请参阅此答案.

Update: I've made a patched version of json_query filter.
See this answer for additional info.

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