Ansible - 从字典列表中的每个字典获取键值

任何不需要在数据上运行模块的数据转换都可以作为过滤表达式更有效地完成。

为了方便起见，为表达式创建一个新变量（尽管想出一个更好的名称）：

fvSubnet_ip: "{{ current | map(attribute='fvSubnet.attributes.ip') }}"

Jinja 内置的地图过滤器只能为您获取一个属性，因此将一系列字典变成一个列表。不太明显的是，点符号可用于查看字典的字典。比链接多个映射函数更紧凑的语法。

转储 fvSubnet_ip 确实会导致

[
        "114.66.71.17/28",
        "1008:125:0:e56::1/64"
    ]

如果还需要基于其他属性进行过滤，请考虑另一个内置过滤器selectattr。首先选择哪个对象，然后提取您需要的属性。这就是 Jinja 过滤器可以链接在一起的原因。

由于这些是 IP 子网，请注意 ipaddr 系列过滤器的存在是为了做有用的事情。 ansible-doc -t filter ipaddr

您可以使用json_query过滤器，它使用JMESPath来提取 JSON 值。

请注意，您必须jmespath在主机上安装。您可以pip为此使用：

pip install jmespath

然后我们可以使用下面的模板：

"{{ current | community.general.json_query('[*].fvSubnet.attributes.ip') }}"

使用您的数据进行调试手册示例：

---
- hosts: localhost
  vars:
    current: [
        {
            "fvSubnet": {
                "attributes": {
                    "annotation": "",
                    "childAction": "",
                    "configIssues": "",
                    "ctrl": "",
                    "debugMessage": "",
                    "descr": "",
                    "dn": "uni/tn-MYBD/BD-VLAN_10/subnet-[114.66.71.17/28]",
                    "extMngdBy": "",
                    "ip": "114.66.71.17/28",
                    "ipDPLearning": "enabled",
                    "lcOwn": "local",
                    "modTs": "2023-07-11T08:18:19.497+00:00",
                    "monPolDn": "uni/tn-common/monepg-default",
                    "name": "",
                    "nameAlias": "",
                    "preferred": "yes",
                    "scope": "public",
                    "status": "",
                    "uid": "19044",
                    "userdom": ":all:",
                    "virtual": "yes"
                }
            }
        },
        {
            "fvSubnet": {
                "attributes": {
                    "annotation": "",
                    "childAction": "",
                    "configIssues": "",
                    "ctrl": "nd",
                    "debugMessage": "",
                    "descr": "",
                    "dn": "uni/tn-MYBD/BD-VLAN_20/subnet-[1008:125:0:e56::1/64]",
                    "extMngdBy": "",
                    "ip": "1008:125:0:e56::1/64",
                    "ipDPLearning": "enabled",
                    "lcOwn": "local",
                    "modTs": "2023-07-11T08:18:19.497+00:00",
                    "monPolDn": "uni/tn-common/monepg-default",
                    "name": "",
                    "nameAlias": "",
                    "preferred": "no",
                    "scope": "public",
                    "status": "",
                    "uid": "19044",
                    "userdom": ":all:",
                    "virtual": "no"
                }
            }
        }
      ]
  tasks:
    - name: Debug
      debug:
        msg: "{{ current | community.general.json_query('[*].fvSubnet.attributes.ip') }}"

输出：

❯ ansible-playbook demo.yaml
[WARNING]: No inventory was parsed, only implicit localhost is available
[WARNING]: provided hosts list is empty, only localhost is available. Note that the implicit localhost does not match
'all'

PLAY [localhost] **********************************************************************************************************

TASK [Gathering Facts] ****************************************************************************************************
ok: [localhost]

TASK [Debug] **************************************************************************************************************
ok: [localhost] => {
    "msg": [
        "114.66.71.17/28",
        "1008:125:0:e56::1/64"
    ]
}

PLAY RECAP ****************************************************************************************************************
localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0