selectattr中的Ansible jinja2转义虚线键

selectattr中的Ansible jinja2转义虚线键,ansible,jinja2,Ansible,Jinja2,我目前正在尝试循环k8s_事实的子集。我的事实看起来像: { "resources": [ { "metadata": { "annotations": { "com.foo.bar/name": "foo", "com.foo.bar/foo-name": "baz" }, "creationTimestamp": "2018-12-20T02:29:50Z", "name": "foo

我目前正在尝试循环k8s_事实的子集。我的事实看起来像:

{
  "resources": [
  { 
    "metadata": {
      "annotations": {
         "com.foo.bar/name": "foo",
         "com.foo.bar/foo-name": "baz"
       },
       "creationTimestamp": "2018-12-20T02:29:50Z",
       "name": "foo-bar"
    }
  },
  ...
我想筛选com.foo.bar/foo-name键的特定值。由于该键具有.、-和/,因此无法与Jinja2 selectattr函数配合使用。我试图做那样的事,但没有成功:

- debug:
    msg: "{{ item }}"
    loop: "{{ my_fact.resources | selectattr('metadata.annotations[\\'com.foo.bar/foo-name\\']', 'defined') | selectattr('metadata.annotations[\\'com.foo.bar/foo-name\\']', 'match', 'baz') | list }}"
  loop_control: 
    label: "{{ item.metadata.name }}"
执行上一个命令时,我得到以下错误:

fatal: [<redacted>]: FAILED! => {"msg": "template error while templating string: expected token ',', got 'com'. String: {{ my_fact.resources | selectattr('metadata.annotations[\\\\'com.foo.bar/foo-name\\\\']', 'defined') | selectattr('metadata.annotations[\\\\'com.foo.bar/foo-name\\\\']', 'match', 'baz') | list }}"}
我的问题是,如何在Jinja2中转义包含点的复杂字符串?

Q:我想筛选com.foo.bar/foo-name键的特定值

A:下面的任务就可以了

- debug:
    msg: "{{ resources|json_query(my_query) }}"
  vars:
    my_query: '[?metadata.annotations."com.foo.bar/foo-name"==`baz`]'

当我在ansible进入逃离地狱时,我倾向于利用。其优点是,它允许您编写jinja块,而不必用引号将它们括起来,从而消除了一个引用级别,因此也消除了一个转义级别

在您的情况下,我认为您可以直接使用,而不是管道一长串的过滤器

这是一个演示剧本:

---
- name: Test var names with dots
  hosts: localhost
  gather_facts: false

  vars:
    my_fact: {
      "resources": [
        {
          "metadata": {
            "annotations": {
              "com.foo.bar/name": "foo",
              "com.foo.bar/foo-name": "baz"
            },
            "creationTimestamp": "2018-12-20T02:29:50Z",
            "name": "foo-bar"
          }
        },
        {
          "metadata": {
            "annotations": {
              "com.foo.bar/name": "toto",
              "com.foo.bar/foo-name": "titi"
            },
            "creationTimestamp": "2018-12-21T02:30:50Z",
            "name": "foo-bla"
          }
        },
        {
          "metadata": {
            "annotations": {
              "com.foo.bar/name": "johnsmith",
              "com.foo.bar/foo-name": "baz"
            },
            "creationTimestamp": "2018-12-22T02:31:50Z",
            "name": "foo-john"
          }
        }
      ]
    }

  tasks:
    - name: Show results where metadata.annotations."com.foo.bar/foo-name"=='baz'
      vars:
        query: >-
          [?(metadata.annotations."com.foo.bar/foo-name")=='baz']
      debug:
        msg: "{{ item }}"
      loop: "{{ my_fact.resources | json_query(query) }}"
      loop_control:
        label: "{{ item.metadata.name }}"
结果呢

PLAY [Test var names with dots] *******************************************************************************************************************************************************************************************

TASK [Show results where metadata.annotations."com.foo.bar/foo-name"=='baz'] **********************************************************************************************************************************************
ok: [localhost] => (item=foo-bar) => {
    "msg": {
        "metadata": {
            "annotations": {
                "com.foo.bar/foo-name": "baz",
                "com.foo.bar/name": "foo"
            },
            "creationTimestamp": "2018-12-20T02:29:50Z",
            "name": "foo-bar"
        }
    }
}
ok: [localhost] => (item=foo-john) => {
    "msg": {
        "metadata": {
            "annotations": {
                "com.foo.bar/foo-name": "baz",
                "com.foo.bar/name": "johnsmith"
            },
            "creationTimestamp": "2018-12-22T02:31:50Z",
            "name": "foo-john"
        }
    }
}

PLAY RECAP ****************************************************************************************************************************************************************************************************************
localhost                  : ok=1    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   


如果我只想显示标记值,我想这会起作用。我想过滤事实,但保持对象的完整性。非常有趣。我不知道您可以使用json查询。我使用了你的解决方案,效果很好。非常感谢您抽出时间: