ansible - 如何获得以逗号分隔的名字列表？

Question

这是我在 YAML 文件中的地址列表:

addresses:
  person1:
    firstname: Maria
    lastname:  Smith
  person2:
    firstname: July
    lastname:  Weber
  person3:
    firstname: John
    lastname:  Kurt
  person4:
    firstname: Simon
    lastname:  Gates

我需要的是逗号分隔的字符串，如 Maria, July, John, Simon

我尝试了以下方法:

firstnames: >-
  {% set lastnames_list= [] %}
  {% for name in addresses %}
      {{ name.firstname | join(",")}}
  {% endfor %}
  {{ lastnames_list }} 

firstnames: >-
  {% set lastnames_list= [] %}
  {% for name in addresses %}
      {{ name | map(attribute="firstname") | join(",") }}
  {% endfor %}
  {{ lastnames_list }} 

firstnames: '{{ addresses | map(attribute="firstname") | join(",") }}' 

但 Ansible 给出了以下输出:

The task includes an option with an undefined variable. The error was: 'unicode object' has no attribute 'firstname'

Answer 1

简单 json_query filter可用于实现结果。

- debug:
    msg: '{{ addresses | json_query("@.*.firstname") | join(", ") }}'

给予

ok: [localhost] => 
  msg: Maria, July, John, Simon