如何在Ansible中使用省略并避免任何错误? [英] How to use omit with Ansible and avoid any errors?

问题描述

我试图对以下表达式使用省略:

I tried to use omit with an expression like this:

id: "{{ openstack_networks.id | default(omit) }}"

但是，当未定义openstack_networks变量时，它似乎总是会因异常而失败.

But it seems that it keeps failing with an exception when openstack_networks variable is not defined.

编写此jinja2过滤器的正确方法是什么?

What is the correct way to write this jinja2 filter?

在openstack_networks.id不存在的情况下，我想省略该参数.

I want to omit the parameter in case openstack_networks.id does not exists.

推荐答案

不是超级优雅，但是100％有效的解决方案可以处理可能未定义的父字典的键:

Not super elegant, but 100% working solution to handle keys of possibly undefined parent dicts:

id: "{{ (openstack_networks | default({})).id | default(omit) }}"

如果已定义openstack_networks但没有id键或未定义openstack_networks，则将为您提供omit.

This will give you omit if openstack_networks is defined but has no id key or if openstack_networks is undefined.

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