如何从Ansible字典中删除单个键？

Question

我想从Ansible的字典中删除一个密钥.

例如,我想这样:

- debug: var=dict2
  vars:
    dict:
      a: 1
      b: 2
      c: 3
    dict2: "{{ dict | filter_to_remove_key('a') }}"

要打印这个:

ok: [localhost] => {
    "dict2": {
        "b": 2,
        "c": 3
    }
}

请注意,字典是从json文件加载的,我将它发布到Grafana REST API.我想允许在文件中保存"id"键并在POST之前删除密钥.

这更接近我删除的实际用途:

- name: Install Dashboards   
  uri:
    url: "{{ grafana_api_url }}/dashboards/db"
    method: POST
    headers:
      Authorization: Bearer {{ grafana_api_token }}
    body:
      overwrite: true
      dashboard:
        "{{ lookup('file', item) | from_json | removekey('id') }}"
    body_format: json   with_fileglob:
    - "dashboards/*.json"
    - "../../../dashboards/*.json"

Answer 1

您可以通过使用 组合和省略来完成此操作

- set_fact:
    dict:
      a: 1
      b: 2
      c: 3

- debug:
    var: dict

- debug:
    msg: "{{ dict | combine({ 'a': omit }) }}"

TASK [test : set_fact] 
ok: [server]

TASK [test: debug] 
ok: [server] => {
    "dict": {
        "a": 1,
        "b": 2,
        "c": 3
    }
}

TASK [test : debug] 
ok: [server] => {
    "msg": {
        "b": 2,
        "c": 3
    }
}

Answer 2

- set_fact:
    dict:
      a: 1
      b: 2
      c: 3
    dict2: {}

- set_fact:
    dict2: "{{dict2 |combine({item.key: item.value})}}"
  when: "{{item.key not in ['a']}}"
  with_dict: "{{dict}}"

- debug: var=dict2

或者创建一个过滤插件并使用它.

Answer 3

  - debug: var=dict2
    vars:
      dict:
        a: 1
        b: 2
        c: 3
      dict2: '{{ dict | dict2items | rejectattr("key", "eq", "a") | list | items2dict }}'
      #dict2: '{{ dict | dict2items | rejectattr("key", "match", "^(a|b)$") | list | items2dict }}'

输出：

ok: [localhost] => {
    "dict2": {
        "b": 2,
        "c": 3
    }
}

Answer 4

这是一种受 John Mazzitelli 的文章启发的方法，可以内联使用set_fact，无需执行其他任务等：

任务：

tasks:
- debug: var=dict2
  vars:
    dict:
      a: 1
      b: 2
      c: 3
    # It is important that there be NO WHITESPACE outside of `{% ... %}` and `{{ ... }}`
    # or else the var will be converted to a string.  The copy() step optionally prevents
    # modifying the original. If you don't care, then: "{% set removed=dict.pop('a') %}{{dict}}"
    dict2: "{% set copy=dict.copy() %}{% set removed=copy.pop('a') %}{{ copy }}"

输出：

TASK [debug] ***********
ok: [localhost] => {
    "dict2": {
        "b": 2,
        "c": 3
    }
}