在 Ansible Jinja2 模板中循环另一个变量时将项目推送到变量 [英] Pushing items to a var while looping over another var in Ansible Jinja2 template

问题描述

库存:

[Test]
local ansible_host=localhost

[Test:vars]
my_clusters="A,B,C"

我正在尝试编写一个对 my_clusters 变量进行迭代的 jinja2 模板.在网络上，我主要发现以下迭代方式(也在这里 Ansible 模板中的 For 循环):

I'm trying to write a jinja2 template iterating over my_clusters var. Over the web mostly I found below way of iterating (Also here For loop in Ansible Template):

{% for item in hostvars[groups['Test'][0]]['my_clusters'].split(',') %}
{{item}}
{% endfor %}

产生输出:

A
B
C

但我的要求是打印字符串Cluster"(逗号分隔在同一行)与否相同的次数.my_clusters 变量中的项目.预期输出:

But my requirement is to print string "Cluster" (comma separated on the same line) as many times the no. of items in my_clusters var. Expected output:

Cluster,Cluster,Cluster

我尝试过类似下面的方法.但它不起作用.

I tried something like below. But it's not working.

{% set str="" %}
{% for cluster in hostvars[groups['Test'][0]]['my_clusters'].split(',') %}
{% str += "Cluster," %}
{% endfor %}
{{str}}

推荐答案

这可以通过 Jinja2 2.10 中引入的赋值:

{% set ns = namespace(str="") %}
{% for cluster in hostvars[groups['Test'][0]]['my_clusters'].split(',') %}
{% set ns.str = ns.str + "Cluster" %}
{%- if not loop.last %}{% set ns.str = ns.str + "," %}{% endif %}
{% endfor %}

<小时>

以上回答了标题中的问题，但您的代码存在一些语法问题:

---

The above answers the question from the title, but there are some syntactical problems with your code:

• 表达式中缺少set，
• 使用 += 运算符，
• 不处理最后一个,.

• lack of set inside the expression,
• using += operator,
• not handling the last ,.

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