Ansible jinja2 将列表合并为一个列表

问题描述

我正在尝试迭代一个列表 ["abc","def","ghi"] &每次迭代都会生成一个列表，我需要将其设置为 ansible 中的变量.

I am trying to iterate a list ["abc","def","ghi"] & each iteration generates a list which i need to set it to a variable in ansible.

这是我当前的脚本:

- name: add checks
  set_fact:
    CHECKS: "{% for cKey in checkKey %} {{ CHECKS|default([]) }} + {{ CHECKSMAP | map(attribute=cKey ) | list |join(',')}} {% endfor %}"

生成以下输出，它是一个字符串 &不是列表，我如何在 for 循环中附加到类似于 list += temp_list 的单个列表

which generates the following output which is a string & not a list how can i append to the single list similar to list += temp_list in a for loop

ok: [127.0.0.1] => {
"msg": "System  [] + [{u'check': u'system_checks'}, {u'check': u'lms_server_health'}]  [] + [{u'check': u'system_checks'}, {u'check': u'config-service_server_health'}, {u'check': u'config-service_server_restart'}] "   }

推荐答案

这是一个字符串有两个原因:首先，你在表达式中间嵌入了一个 " + " 位文本，第二个是因为你调用了 join(',') 和 jinja 很高兴地按照你的要求去做.

It's a string for two reasons: first off, you embedded a " + " bit of text in the middle of your expression, and the second is because you called join(',') and jinja cheerfully did as you asked.

如何在 for 循环中附加到类似于 list += temp_list 的单个列表

答案是完全按照你说的去做，并使用一个中间变量:

The answer is to do exactly as you said and use an intermediate variable:

CHECKS: >-
  {%- set tmp = CHECKS | default([]) -%}
  {%- for cKey in checkKey -%}
  {%-   set _ = tmp.extend(CHECKSMAP | map(attribute=cKey ) | list) -%}
  {%- endfor -%}
  {{ tmp }}

AFAIK，你必须使用那个 .extend 技巧，因为 set tmp = tmp + 将在循环内声明一个新的 tmp，而不是在循环外分配 tmp

AFAIK, you have to use that .extend trick because a set tmp = tmp + will declare a new tmp inside the loop, rather than assigning the tmp outside the loop

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