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，如果程序无法执行，则|d()将允许变量(例如reports或forecast)在最后默认为默认变量(在这种情况下，默认变量为[e-mail]).找不到reports或forecast的实例. reports& forecasts是在某些环境中定义的，但不是在所有环境中定义的，因此我无法从脚本行中删除这些变量.在Ansible 2.X中，不需要默认的过滤器|d()，并且代码可以这样编写:

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，出现此错误:

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

致命:[localhost]:失败！ => {"failed":true，"msg":字段'args'的值无效，该值似乎包含未定义的变量.错误是:'dict object'没有属性'reports'\ n \ n错误似乎出在'/home/ansible/svn/stable-1.6-ansible2_other/playbooks/buildEnvironment/temp2.​​yml'中:第21行第7列，但根据确切的语法可能\ n在文件的其他位置问题.\ n \ n令人反感的行似乎是:\ 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"}

在此问题上或如何为Ansible 2.X使用默认变量过滤器的任何帮助将不胜感激！

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

推荐答案

我这样做是这样的:

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

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