Ansible 2.0 升级 - 默认过滤器链错误 [英] Ansible 2.0 upgrade - default filter chain error

问题描述

在 Ansible 2.0 之前，允许使用默认过滤器

Prior to Ansible 2.0, default filters were allowed

"{{ oracle1.instance.reports|d().forecast|d().email|d('[e-mail]') }}"

其中 |d() 将允许变量(例如 reports 或 forecast)在末尾默认为默认变量(在这种情况下，默认变量是 [e-mail])如果程序找不到 reports 或 forecast 的实例.报告 &forecasts 在某些环境中定义，但不是在所有环境中定义，因此我无法从脚本行中删除这些变量.在 Ansible 2.X 中，默认过滤器 |d() 不是必需的，代码可以这样编写:

where |d() would allow a variable (such as reports or forecast) to be defaulted to the default variable at the end (in this case, the default variable is [e-mail]) if the program couldn't find an instance for reports or forecast. reports & forecasts are defined in some environments, but not in all, so I cannot remove these variables from the script line. In Ansible 2.X, the default filter |d() is not necessary and the code can be written like this:

"{{ oracle1.instance.reports.forecast.email|d('[e-mail]') }}"

运行上面的脚本时，我收到此错误:

When running the script above, I am getting this error:

致命:[本地主机]:失败！=> {"failed": true, "msg": "字段 'args' 有一个无效值，它似乎包含一个未定义的变量.错误是:'dict object' 没有属性 'reports'\n\n错误似乎在 '/home/ansible/svn/stable-1.6-ansible2_other/playbooks/buildEnvironment/temp2.​​yml':第 21 行，第 7 列，但可能\n在文件中的其他地方，具体取决于确切的语法问题.\n\n违规行似乎是:\n\n ignore_errors: false\n - 调试:\n ^ here\n"}

fatal: [localhost]: FAILED! => {"failed": true, "msg": "the field 'args' has an invalid value, which appears to include a variable that is undefined. The error was: 'dict object' has no attribute 'reports'\n\nThe error appears to have been in '/home/ansible/svn/stable-1.6-ansible2_other/playbooks/buildEnvironment/temp2.yml': line 21, column 7, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n ignore_errors: false\n - debug:\n ^ here\n"}

任何有关此问题或如何为 Ansible 2.X 使用默认变量过滤器的帮助将不胜感激！

Any help on this matter or how to use default variable filters for Ansible 2.X would be much appreciated!

推荐答案

我是这样做的:

"{{ ((((oracle1 | default({})).instance | default({})).reports | default({})).forecast | default({})).email | default('[e-mail]') }}"

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