jinja2嵌套变量 [英] jinja2 nested variables

问题描述

我目前正在学习jinja2，但不确定如何正确处理变量:

I am currently learning jinja2 and i am unsure on how to address variables the correct way:

这是我在yaml中的变量:

Here are my variables in yaml:

---
hosts:
   app201.acme.com: {eth0: {ip: 46.0.0.1, netmask: 255.255.255.255}}
   graphite.acme.com: {eth0: {ip: 46.0.0.2, netmask: 255.255.255.255},
                       eth0.1: {ip: 10.2.90.1, netmask: 255.255.255.255}}

，这里是jinja2模板:

and here the jinja2 template:

{{ fqdn }}
{% for interface in hosts[fqdn] %}
    {{ interface }}
    {{ hosts[fqdn].interface.ip }} << doesn't work
    {{ hosts[fqdn].{{ interface }}.ip }} << doesn't work
    {{ interface.ip }} << doesn't work
{% endfor %}

所以当前我的输出看起来像这样，因为我无法访问Yaml哈希的第二维.

so currently my output looks like this since I can't access second dimension of yaml hash.

graphite.acme.com eth0.1

graphite.acme.com eth0.1

eth0

推荐答案

变量hosts是dict.在dict中访问值的正确方法是使用[]运算符.

The variable hosts is a dict. The correct way to access values in dict is to use [] operator.

{{ fqdn }}
{% for interface in hosts[fqdn] %}
    {{ interface }}
    {{ hosts[fqdn][interface]['ip'] }}
{% endfor %}

.运算符用于访问对象的属性.

. operator is used to access attribute of an object.

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