包含的json格式查询 [英] json format query with contains

问题描述

我在ansible中有以下json输出:

I have the following json output in ansible:

[{
    "active_transaction": null,
    "cores": 4,
    "hostname": "alpha-auth-wb01"
},
{
    "active_transaction": null,
    "cores": 4,
    "hostname": "beta-auth-wb01"
}]

现在，我尝试过滤输出以仅显示主机名包含字母的输出.

Now I am trying to filter the output to just show the output where the hostname contains alpha for example.

输出应为:

[{
    "active_transaction": null,
    "cores": 4,
    "hostname": "alpha-auth-wb01"
}]

代码和结果:

可用的代码

jq: "[?contains(hostname, 'alpha')]"


fatal: [worker.domain]: FAILED! => {"msg": "JMESPathError in json_query filter plugin:\\nIn function contains(), invalid type for value: None, expected one of: ['array', 'string'], received: \\"null\\""}

还尝试添加from_json | to_json和另一种方法.仍然失败.

Also tried adding from_json | to_json and the other way around. Still fails.

任何想法都值得赞赏！

Any ideas much appreciated!

推荐答案

正如@Matthew L Daniel提到的那样，由于引用问题，您应该将查询存储在变量中.您的查询也不正确，对于您想要的.据我了解，您想选择所有元素，其中hostname包含字符串alpha.完整的解决方案如下:

As @Matthew L Daniel mentioned, you should store your query in a variable, because of quoting issues. Also your query is incorrect, for what you want. As I understood, you would like to select all elements, where the hostname contains the string alpha. A fully working solution is the following:

---
- hosts: localhost
  gather_facts: False

  vars:
    jq: "[?contains(hostname, 'alpha')]"
    json: |
      [{
          "active_transaction": null,
          "cores": 4,
          "hostname": "alpha-auth-wb01"
      },
      {
          "active_transaction": null,
          "cores": 4,
          "hostname": "beta-auth-wb01"
      }]

  tasks:
  - name: DEBUG
    debug:
      msg: "{{ json | from_json | json_query(jq) }}"

如果您不想在变量中编写json_query，则可以这样引用:

If you don't want to write your json_query in a var you could quote it like this:

"{{ json | json_query(\"[?contains(hostname, 'alpha')]\") }}"

但是我建议将其放入变量中.

But I would recommend, to put it in a var.

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